jack n. [the name Jack. short for Jacob, var. of John, Johan, Middle English Jacke, French Jacques] 1. often Jack. a. a man or boy, esp. one employed in manual labor : SERVANT; LABORER; LUMBERJACK; SAILOR. b. JACK OF ALL TRADES. c. informal. fellow; buddy; man, usu. used in addressing a stranger. 2. U.S. playing card showing the figure of a knave, usu. ranking below a queen. 3. a. any of various portable devices for lifting or moving heavy objects short heights by means of force applied with a lever, screw, or hydraulic press. b. a wooden wedge for cleaving rock. c. Naut. support or brace, esp. the iron crosstree on a top-gallant masthead. d. a device for turning a spit in roasting meat. 4. the male of certain animals, esp. the ass. 5. any of various food and game fishes, esp. (Caranx), of the Atlantic and Pacific waters : POMPANO; TUNA. 6. Brit. a pin used in some lawn bowling games. 7. also jackstone. a small six-pointed metal piece used to play the children's game jacks or jackstones, a game played with several pieces and a small ball, the object being to pick up the pieces in various ways while tossing the ball. 8. Elect. connecting device to which wires of a circuit may be attached and which is arranged for insertion of a plug. 9. a small wooden rod in the mechanism of a harpsichord, spinet, or virginal that rises when the key is depressed and causes the attached plectrum to strike the string. 10. Naut. a small flag displayed at the bow of a ship, usu. to indicate nationality. 11. a defensive coat, usually of leather, formerly worn by foot soldiers and others : JACK OF PLATE. 12. Austral. Slang. a nickname for a policemen or detective. 13. a. Slang. MONEY. b. Austral. Slang. a double-headed penny used for cheating. 14. a. APPLEJACK. b. BRANDY. 15. JACK-LIGHT. 16. also jaca : JACKFRUIT. 17. Austral. Slang. venereal disease. 18. Urban Slang. absolutely nothing; a shortened form of jack shit or jack squat : DIDDLY. 19. an archaic unit of volume equal to two fluid ounces or one quarter cup. 20. n. Geog. a. a U.S. town located in SE Ala. NW of Fort Rucker. b. a U.S. county in N central Tex. NE of Fort Worth; foun. 1856. 

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Jack n. 1. a Brit. folk hero and stock character appearing in legends, fairy tales, and nursery rhymes; generally portrayed as a young adult and often portrayed as lazy or foolish, but through the use of tricks, usually emerges triumphant. Some of the most famous include Jack and the Beanstalk, Jack Frost, Jack the Giant Killer, Little Jack Horner, and This Is the House That Jack Built. 2. Film. Jack (1996), a U.S. comedy-drama starring Robin Williams as Jack Powell, a boy who ages four times faster than normal as a result of a disease.

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jack v. 1. to hunt or fish at night with a jacklight. 2. to move or lift with a jack. 3. to raise or increase the value of something. ~ jack up. 4. to bolster confidence in : SUPPORT. 5. Urban Slang. to steal, or take from an unsuspecting person or store. 6. Baseball. to hit the ball hard, esp. out of the field producing a home run.

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jack adj. 1. Carpentry. having a height or length less than that of most others in a structure. ~ jack rafter, ~ jack truss. 2. Rel. one who professes to be of a certain faith, yet fails to act accordingly. ~ Jack-Mormon. 

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Jack3D n. a dietary supplement specifically marketed to those involved in bodybuilding, weightlifting and athletics.

jackable adj. capable of being lifted with a jack.

Jack Adams Award n. [in honor of Hall of Fame NHL player Jack Adams (1861-1920)] awarded annually to the NHL coach "adjudged to have contributed the most to his team's success."

jack-a-dandy n. DANDY.
 

jackal n. 1. a wild dog, esp. (Canis aureus), of Asia and Africa, about the size of a fox. 2. one who does menial tasks for another. 3. VILLAIN; SCOUNDREL.

Jack Albertson n. Bio. (1907-81), a U.S. actor, comedian, dancer, singer, and musician; Grandpa Joe in Willy Wonka and the Chocolate Factory (1971); won an Emmy for his role as "The Man" in the TV sitcom Chico and the Man.

jackal buzzard n. an African bird of prey (Buteo rufofuscus).

Jack-a-Lent n. 1. a small stuffed puppet set up to be pelted for fun in Lent. 2. simple or insignificant person.

jackalope n. a mythical animal of North American folklore described as a jackrabbit with antelope horns.

jackanapes n. [var. of Jack Napes, nickname of William, Duke of Suffolk] 1. an impudent or conceited fellow; saucy or mischievous child : WHIPPERSNAPPER. 2. Archaic : MONKEY; APE.

Jack & Diane n. 1. Music. a rock song by John Cougar Mellencamp, featured on his album American Fool (1982). 2. Film. Jack & Diane (2012), a U.S. romantic horror film, starring Riley Keough and Juno Temple.

 

Jack and Jill n. 1. two characters in a nursery rhyme, that fell down a hill. 2. Urban Slang. VIAGRA®. 3. a U.S. Ice cream company, Jack and Jill Ice Cream Co., located in Bensalem, Penn., foun. 1929. 4. Film. Jack and Jill vs. the World (2008), a U.S. comedy-romance-drama, starring Freddie Prinze, Jr. and Taryn Manning. 5. Film. Jack and Jill (2011), a U.S. comedy, starring Adam Sandler, Katie Holmes, and Al Pacino; considered to be one of the worst films ever made, winning 10 Razzie Awards, the most ever by one film.

Jack and the Beanstalk n. 1. an English fairy tale, closely associated with the tale Jack the Giant Killer. 2. Film. any of numerous films, TV movies, and video shorts titled Jack and the Beanstalk and based on the fairy tale.

jack apple n. Brit. Slang. dottering fool.

jack apple v. Brit. a term used by British sailors in the 1800s for the apples kept fresh on the ship by floating in a barrel of rum, and if they ate too many they would become jack-appled.

jack arch n. Masonry. a structural element that provides support at openings in masonry : FLAT ARCH; STRAIGHT ARCH.

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jackass n. 1. a male donkey. 2. a stupid person; blockhead : FOOL. 3. an obnoxious rude person.

Jackass n. 1. TV. a U.S. TV series (2000-02) on MTV featuring people performing various dangerous, crude, self-injuring stunts and pranks, starring Johnny Knoxville, Bam Margera, and Steve-O. 2. Film. Jackass: The Movie (2002) is a U.S. reality comedy with the tagline "Do not attempt this at home," a continuation of the stunts and pranks performed on the MTV TV series Jackass; produced by MTV Films and Dickhouse Productions. 

Jackass Aeropark n. Geog. (LOC ID : U75), a public-use airport located in Amargosa Valley, Nevada, named after Jackass Flats, Nevada, where wild jackasses once gathered to graze on the Nevada test site.

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Jackass Flats n. Geog. a shallow basin located east of Yucca Mountain, in the southwest portion of the Nevada National Security Site in Nye County, Nevada, a former nuclear-test site.

jackass penguin n. an African penguin with a donkey-like bray (Spheniscus demersus), confined to southern African waters : BLACK-FOOTED PENGUIN.

jackass-barque also spelled jackass bark n. Naut. a sailing ship with three (or more) masts, of which the foremast is square-rigged and the main is partially square-rigged and partially fore-and-aft rigged.

jackass morwong n. a morwong fish (Nemadactylus macropterus), found off southern Australia and New Zealand : TARAKIHI.

Jackass Mountain n. Geog. a mountain in the Canadian Range in southwestern B.C., Can., named for the mule-trains that ventured north to the Cariboo gold fields.

jackassery n. a stupid or foolish act.

jackass rig n. Naut. a nonstandard combination of square rig and fore-and-aft rig on a sailing ship with two or more masts.

 

Jack Attack n. a platform action video game published in 1983 for the Commodore 16, Commodore Plus/4, and Commodore 64.

jack-ball n. a ball used in boules.

Jack Barry n. Bio. [Jack Barasch] (1918-84), a U.S. game show host; nearly ruined in the quiz show scandal of the late 1950s, but made a successful comeback over a decade later. 

Jack Barstow Muncipal Airport n. Geog. (LOC ID : IKW), a city owned, public use, U.S. airport located 3 NM NW of Midland, Mich.

Jack Bauer n. TV. a fictional character of the Fox series 24, played by Kiefer Sutherland.

jack bean n. a bushy annual tropical American legume (Canavalia ensiformis), with long pods and purple flower clusters, grown especially for forage.

Jack Be Nimble n. a nursery rhyme character, who jumps over a candlestick.

Jack Benny n. Bio. [Benjamin Kubelshy] (1894-1974), a U.S. comedian, vaudevillian, radio, TV, film actor, and violinist.

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Jack Black n. Bio. [Thomas Jacob Black] (b. 1969), a U.S. actor, comedian, writer, and musician; lead vocalist of the comedic rock group Tenacious D.

jackboot also jack boot n. 1. a military boot reaching above the knee. 2. a ruthless bully. 3. an aggressive or totalitarian, esp. military, policy, or regime.

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Jack Brickhouse n. Bio. [John Beasley Brickhouse] (1916-98), a U.S. Hall of Fame sports announcer; best known for coverage of Chicago Cubs games on WGN-TV (1948-81).

Jack Briggs n. Bio. (1920-1998), a U.S. actor; husband of U.S. actress Ginger Rogers.

Jack Barstow Muncipal Airport n. Geog. [after local pilot John "Jack" Barstow] (LOC ID : IKW), a city owned, public use, U.S. airport located near Midland, Mich. 

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Jack Brooks Regional Airport n. Geog. [after U.S. Rep. Jack Bascom Brooks (D) (1922-2012), from Beaumont who served in the U.S. House for 42 years] (LOC ID : BPT), a public-use U.S. airport located near Port Arthur, Tex., formerly the Jefferson County Airport.

Jack Buck n. 1. Bio. [Joseph Francis Buck] (1924-2002), a U.S. Hall of Fame sports announcer; best known for coverage of St. Louis Cardinal baseball games. 2. a fireboat operated by the St. Louis Fire Dept., the department’s largest vessel, comm. 2003.

Jack Bull (1999) n. Film. a TV western shown on HBO, starring John Cusack and John Goodman.

Jack-by-the-hedge also Jack-in-the-bush n. Brit. a folk name given to garlic mustard, a biennial flowering plant in the Mustard family (Alliaria petiolata), native to Europe, Asia, and Africa; often found growing along the margins of hedges : GARLIC MUSTARD; GARLIC ROOT; POOR MAN’S MUSTARD; PENNY HEDGE.

Jack Cade Rebellion n. Brit. Jack Cade lead an army of rebels, angered by debt, corruption, and abuse of power surrounding the King Henry VI regime, which marched on London in order to force the government to remove the traitors surrounding the king.

Jack Casady n. Bio. [John William Casady] (b. 1944), a U.S. Hall of Fame musician; member of Jefferson Airplane and Hot Tuna.

Jack Cassidy n. Bio. [John Joseph Edward Cassidy] (1927-76), a U.S. actor, singer, and director of stage, film, and television. 

jack chain n. a type of chain made of thin wire, with figure-eight-shaped links, and loops at right angles to each other; often used to suspend fixtures such as lights or signs, for decorative purposes, or as part of a cable lock.

Jack change IT n. a simple shedding-type card game popular among children, usually played by two to six players, whose purpose is to discard all of your cards before your opponents.

jack cheese n. MONTEREY JACK.

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Jack County n. Geog. a county located in Texas (pop. 9,044) named for brothers Patrick Churchill Jack and William Houston Jack, both soldiers of the Texas Revolution; foun. 1856; its county seat is Jacksboro.

Jack Cracker n. Film. a fictional character, a homeless man who lives in the swamp, appearing in the slasher films Hatchet (2006) and Hatchet II (2010), portrayed by John Carl Buechler.

Jack Creek n. Geog. 1. a township in N central Iowa near Minn. border. 2. a ghost town in NE Nevada N of Elko. 3. a stream in S Minn.; a tributary of Heron Lake, the outlet of which flows to the Des Moines River.

jack crevalle n. CREVALLE JACK.

Jack Crisp n. a yellow-brown and white, horned Channel Island breed of dairy cattle, originating from the island of Guernsey in the English Channel : GUERNSEY.

jack crosstree n. Naut. a horizontal bar or crosstree of iron at the topgallant masthead, to spread the royal shrouds.

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Jack Daniel's® n. [after founder and distiller Jasper Newton "Jack" Daniel (1850-1911)] a brand of Tennessee whiskey, distilled and bottled by the Jack Daniel's Distillery, located in Lynchburg, Tenn., foun. 1875.

jackdaw n. 1. a glossy black and gray European bird (Corvus monedula), of the crow family, frequenting steeples, ruins, etc. 2. the great tailed grackle (Cassidix Mexicanus), a large glossy blackbird of the southern U.S. and Mexico. 

Jack Dawkins n. Lit. a fictional character in the Charles Dickens novel Oliver Twist, better known as the Artful Dodger; a pickpocket and leader of a gang of child criminals.

Jack Dawson n. Film. a fictional, main character in the U.S. film Titanic (1997), who won two tickets onto the RMS Titanic in a poker game and travels as a third-class passenger; portrayed by Leonardo DiCaprio.

Jack Dempsey n. Bio. "Kid Blackie" "The Manassa Mauler" [William Harrison Dempsey] (1895-1983), a U.S. boxer and heavyweight champion (1919-1926).

Jack Dodson n. Bio. [John S. Dodson] (1931-94), a U.S. actor; Howard Sprague on the TV series The Andy Griffith Show.

jacked adj. 1. Slang. high on drugs or stimulants. 2. Slang. strong and/or muscled. 3. Slang. broken, imperfect, esp. when followed by 'up' ~ jacked up. 

Jack Edwards National Airport n. Geog. [after U.S. Rep. William Jackson Edwards (R), who served in the U.S. House for 20 years] (LOC ID: JKA), a public use airport in Baldwin County, Ala. located north of the City of Gulf Shores. 

Jack Elam n. Bio. [William Scott Elam] (1920-2003) a U.S. film and TV actor; best known for his roles as villains in Westerns films.

 
Jack Elementary School n. Portland, Maine’s largest public elementary school until its closure in 2001; and torn down as a result of the mold contamination. 

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Jack Entertainment, LLC n. (formerly Rock Gaming LLC) a gaming, hospitality, and entertainment corp. based in Detroit, Michigan that owns and operates casinos and hotels in Michigan and Ohio. ~ Jack Detroit Casino-Hotel Greektown, ~ Jack Cincinnati Casino, ~ Jack Cleveland Casino, ~ Jack Thistledown Racino. 

jack field also patch panel, patch bay, or patch field n. a device or unit featuring a number of jacks, usu. of the same or similar type, for connecting and routing circuits for monitoring, interconnecting, and testing circuits in a convenient, flexible manner; commonly used in computer networking, recording studios, radio, and TV. 

jackeroo also jackaroo n. Austral. Slang. a male novice on a sheep station or cattle ranch.

jacket n. 1. a short, coat-like garment. 2. something worn or fastened around the body not used as clothing. ~ strait-jacket, ~ life jacket. 3. the natural covering of an animal; the fur or wool of a mammal. 4. the skin of a potato. 5. any covering meant to insulate, protect, or toughen; as, a. the outer metal casing of a bullet. b. the cover of a book. ~ dust jacket. c. an envelope for a phonograph record. 6. U.S. a folded paper or envelope containing an official document.

jacket v. to put a jacket on; enclose with a jacket.

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Jackfish n. Geog. a ghost town in N. Ontario, Can., on the N. shore of Lake Superior, E. of Terrance Bay; est. c.1885 as a train order station on the CPR (Canadian Pacific Railway) and became a port for commercial fisherman. 

jackfish n. referring to any of various food and game fishes, esp. (Caranx), of the jack family.

Jack Flash n. 1. Lit. a comic strip character from the planet Mercury, sporting four tiny wings on his ankles, thought to be the source of his flying ability; published in the in the U.K. comic book magazine The Beano, first appearing in 1949. 2. an easy to grow cannabis hybrid made by crossing Jack Herer with Skunk and Haze.

Jack FM. n. Trademark. a radio station branding licensed by Sparknet Communications in Can., U.S., U.K., and Russia; using the slogan and philosophy "playing what we want." 

Jack Frost n. 1. frost or cold weather personified. 2. Film. Jack Frost (1998) a U.S. Christmas fantasy film about a man who dies in a car accident and comes back to life as a snowman, starring Michael Keaton and Kelly Preston.

jackfruit n. 1. a. a Polynesian, moraceous tree (Artocarpus heterophyllus), bearing a fruit resembling breadfruit. b. the fruit itself, which may weigh up to 70 pounds. 2. a tree (Durio zibethinus), of SE Asia, bearing edible fruit : DURIAN.

Jack Garland Airport n. Geog. [after Parliament Member Jack Garland] (LOC ID : YYB), an airport located in North Bay, Ontario, Canada; the airport serves as a North American Aerospace Defense Command (NORAD) base. 

Jack-go-to-bed-at-noon n. a biennial plant (Tragopogon pratensis), distributed across Europe and North America, commonly growing in fields and on roadsides.

Jack Graham n. Bio. [John Gilbert Graham] (1932-57), a U.S. mass murderer who killed 44 people aboard United 629 using a time bomb planted in his mother's suitcase, who was also killed, in an apparent move to claim $37,500 in life insurance purchased at the airport terminal; convicted of murder and executed by the state of Colorado. 

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Jack Haley n. Bio. [John Joseph Haley] (1899-1979), a U.S. actor; best known as the Tin Man in the film The Wizard of Oz (1939). 

Jack Ham n. Bio. [Jack Raphael Ham, Jr.] (b. 1948) an NFL linebacker who played for the Pittsburgh Steelers from 1971 to 1982; considered one of the greatest outside linebackers in NFL history.

jackhammer n. a portable pneumatic drill powered by compressed air, typically used to break up rock, pavement, and concrete.

Jack Hawn Creek n. Geog. [after early citizen Jack Hawn] a stream in Bollinger County, Mo.; a tributary of Buck Creek. 

Jack Henry & Assoc. n. [after founder and software designer Jack Henry] U.S. banking software company located in Monett, Mo., foun. 1976. NASDAQ : JKHY.

Jack Herer n. [after author and pro-hemp activist Jack Herer, "Emperor of Hemp" (b. 1939)] an unstable cannabis hybrid made by crossing Skunk, Northern Lights, and Haze; winner of the seventh High Times Cannabis Cup.

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Jack Hills n. Geog. a range of hills in Western Australia; best known as the source of zircons that formed over four billion years ago, the oldest material of terrestrial origin found to date.

jackie n. [the name Jackie. short for Jacqueline, also Jacky] 1. SAILOR. 2. Brit. Slang. gin.

Jackie Brown n. Film. a fictional character in the film Jackie Brown (1997), written and directed by Quentin Tarantino; an adaptation of Elmore Leonard's novel Rum Punch (1992).

Jackie Chan n. Bio. [Chan Kwong Sang] (b. 1954), a Hong Kong actor, martial artist, director, producer, stuntman, and singer; known for his acrobatic fighting style, comic timing, use of improvised weapons, and innovative stunts, which he typically performs himself.

Jackie Coogan n. Bio. [John Leslie Coogan] (1914-84), a U.S. actor and comedian; Uncle Fester in the '60s TV series The Addams Family.

Jackie Cooper n. Bio. (1922-2011), a U.S. actor, director; a child actor who managed to make the transition to an adult career.

Jackie Gleason n. Bio. [John Herbert Gleason] (1916-87), a U.S. comedian, actor, and musician; known for his brash comedy style, exemplified by his character Ralph Kramden in the TV series The Honeymooners.

Jackie Howe n. [after famous Queensland sheep sheerer John Robert Howe (1861-1920)] Austral. Slang. a black or blue short-sleeved shirt favored by shearers.

Jackie Joyner-Kersee n. Bio. (b. 1962), a U.S. track and field athlete, Olympic medalist.

Jackie Mason n. Bio. [Yacov Moshe Maza] (b. 1931), a U.S. actor and stand-up comedian.

Jackie Kennedy Onassis n. Bio. [Jacqueline Lee Bouvier] (1929-94), a former U.S. First Lady; wife of John F. Kennedy (1953-63) and Aristotle Onassis (1968-75).

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Jackie Robinson n. Bio. 1. [Jack Roosevelt Robinson] (1919-72), a U.S. baseball player; the first African American to play in Major League Baseball the modern era. 2. Film. The Jackie Robinson Story (1950), a biographical film directed by Alfred E. Green and starring Jackie Robinson as himself. 3. Jackie Robinson Day, a traditional event occuring on April 15th each year in Major League Baseball, commemorating and honoring the day Jackie Robinson made his major league debut.

Jackie Stewart n. Bio. "The Flying Scot" [Sir John Young Stewart] (b. 1939), a Scottish Formula One racing driver.
jacking n. a street robbery. 

Jack-In-Irons n. Brit. Folklore. a mythical giant of Yorkshire lore who haunts lonely roads, covered with chains, wearing the heads of his victims, and wielding a large, spiked club.

jack-in-office n. Pejorative a self-important but minor official.

jack-in-the-box also jack-in-a-box n. 1. a toy consisting of a box from which, upon release of its lid, an enclosed figure springs up. 2. a U.S. fast-food hamburger chain, Jack in the Box Inc. foun. 1951, with a large headed mascot named Jack. NASDAQ : JACK.

Jack-in-the-bush n. Brit. JACK-BY-THE-HEDGE.

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Jack-in-the-Green also Jack i' the Green, Jack o' the Green, Jack-of-Green n. Brit. Folklore. a participant in traditional May Day parades, who wears a large, foliage-covered, garland-like framework, usu. pyramidal or conical in shape, which completely covers their body from head to foot; also applied to the garland itself. 

jack-in-the-pulpit n. 1. a spring-flowering herb (Arisaema triphyllum), growing in damp woods, with a spike of tiny yellow flowers arched over by a hood-like green and purple spathe, native to North America : INDIAN TURNIP. 2. a common woodland plant species (Arum maculatum), widespread across temperate N Europe. 3. a well-known series of string figures created between two people as a game : CAT’S CRADLE.

jacking also jackin' v. 1. to illegally, without the owner's permission, take possession of something by either surreptitiously or through force taking control of or carrying away : CARJACKING; HIJACKING; NAMEJACKING. 2. a sexually charged dance technique that was popular in the late 1980s, from the early Chicago house music scene, with couples grinding their pelvises together. 

Jack-Jack Attack n. Film. a 2005 computer animated short film produced by Pixar based on their film The Incredibles.

Jack Johnson n. Bio. "The Galveston Giant" [John Arthur Johnson] (1878-1946), a U.S. boxer; the first African American heavyweight champion (1908–1915).

Jack Jouett n. Bio. [John Jewett, Jr.] (1754-1822), a U.S. politician and hero of the American Revolution hero; known as the "Paul Revere of the South" for his late night ride. 

jack jumper ant n. a species (Myrmecia pilosula), native to Australia; commonly known as the hopper ant, jumper ant, or jumping jack, usu. found in Tasmania and southeast mainland Australia; known for the ability to jump long distances.

Jack Kelly n. Bio. (1927-92), a U.S. actor; noted for the role of Bart Maverick on the TV series Maverick.

Jack Kemp n. Bio. [Jack French Kemp] (1935-2009), a U.S. football player; politician; U.S. Rep., (R) N.Y.; former HUD Secretary.

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Jack Kennedy n. Bio. [John Fitzgerald Kennedy] (1917-63), a U.S. politician; 35th president of the U.S. (1961-63).
 

Jack Ketch n. [after Brit. executioner Jack Ketch (1663-86), noted for brutality] Brit. a public executioner or hangman.
 

Jack Klugman n. Bio. [Jacob Joachim Klugman] (1922-2012), a U.S. actor; best known as Oscar Madison in the TV series The Odd Couple and as the title role in Quincy, M.E.
 

jackknife n. 1. a knife with blades that can be folded back into the handle : POCKETKNIFE. 2. a type of high-dive in which the diver bends double, then straightens out. 3. a pinning hold in wrestling. 4. Statistics. a resampling technique. 5. Exercise. an abdominal exercise.
 

jackknife v. 1. to cut with a jackknife. 2. to double up or fold at an acute angle like a folding pocketknife. 3. to turn or rise and form a 90 degree angle or less, as a tractor-trailer. 4. a type of crash with articulated vehicle combinations. 

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jackknife clam n. a common name used for several species (Ensisand Solen), which are found on Atlantic and Pacific beaches N. America; having thin, highly elongate shells.
 

jackknifefish n. a small fish (Equetus lanceolatus), found on coral reefs in the Atlantic Ocean, Caribbean, Gulf of Mexico, Florida, and the Bahamas.
 

jack ladder also Jacob's ladder n. Naut. a hanging rope or chain ladder having wooden or metal rungs or steps. 
 

Jack Lake n. Geog. a small headwater in Ontario, Canada.
 

Jack LaLanne n. Bio. "The Godfather of Fitness" [Francois Henri LaLanne] (b. 1914-2011), a U.S. fitness, exercise, nutrition expert and motivational speaker. 

Jack Lambert n. Bio. [John Harold Lambert] (b. 1952), a U.S. football player; played for the Pittsburgh Steelers on four Super Bowl winning teams during an 11-year career.

Jack Larson n. Bio. [Jack Edward Larson] (1933-2015), a U.S. actor, producer, and playwright; portrayed Jimmy Olsen in the '50s TV version of Superman.

jackleg adj. U.S. Slang. 1. lacking skill or trade : AMATEUR. 2. characterized by unscrupulousness, dishonesty, or lack of professional standards. 3. designed as a temporary expedient : MAKESHIFT.

Jack Lemmon n. Bio. [John Uhler Lemmon] (1925-2001), a U.S. Academy Award winning actor; Best Supporting Actor for Mister Roberts (1955) and Best Actor for Save The Tiger (1973).

jacklight n. 1. a portable light used for nighttime hunting or fishing. 2. a 1984 poetry collection by Louise Erdich.

jackline n. a rope or wire strung from a ship's bow to stern to which a safety harness can be clipped, allowing a crewmember to move about the deck safely.

Jack Link's Beef Jerkey n. [after founder John "Jack" Link] a U.S. snack food company located in Minong, Wisc., foun. 1986, specializing in beef-jerky.

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Jack London n. 1. Bio. [John Griffith Chaney] (1877-1916), a U.S. writer of novels based on experiences in the Klondike Gold Rush, wrote Call of the Wild (1903). 2. Austral. a men's fashion label, stocked in a variety of boutiques around Australia. 3. Film. The Story of Jack London (1943), a biographical film based on The Book of Jack London (1921). 4. Geog. a district of Oakland, Calif. that includes and surrounds Jack London Square, a popular tourist attraction on the waterfront. 

Jack Lord n. Bio. [John Joseph Patrick Ryan] (1920-98), a U.S. actor; Steve McGarrett on the TV series Hawaii 5-0.

jack mackerel n. a food and game fish (Trachurus symmetricus), of U.S. Pacific coastal waters, that is green or bluish above and silvery below. 

jackman n. 1. Motor Racing. a member of the pit crew responsible for lifting the car with a jack. 2. Obsolete. one wearing a jack; a horse soldier; a retainer. 3. Obsolete. a cream cheese. 

jack mackerel n. a fish in the Trachurus genus of the family Carangidae : SAURELS.

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Jack McFarland n. TV. [John Philip McFarland] a fictional character on the TV sitcom Will & Grace, played by Sean Hayes. 

Jack McNamara Field n. Geog. Del Norte County Regional Airport (LOC ID : CEC), a public-use airport located three miles NW of Crescent City, Calif.

Jack Mercer n. Bio. (1910-84), a U.S. animator, writer, artist; best known as the voice of Popeye the Sailor and Felix the Cat.

Jack "Clayton" Moore n. Bio. [Jack Carlton "Clayton" Moore] (1914-1999), a U.S. Actor: The Lone Ranger. 

Jack Mormon n. Rel. a slang term originating in nineteenth-century America; originally used to describe a person who was not a baptized member of the Mormon Church; later to describe an inactive or lapsed member.

Jack Mountain n. Geog. 1. one of the highest mountains (elev. 9,066 ft.) in N central Washington, in North Cascades National Park near the Canadian border. 2. a mountain (elev. 899 ft.) in central Texas; formerly known as Graham Mountain, within the boundaries of Fort Hood.

Jack Murphy n. Bio. "Murph the Surf" [Jack Roland Murphy] (b. 1938), a surfing champion, musician, author, thief, and convicted murderer; involved in the biggest jewel heist in American history at the American Museum of Natural History.

Jack Nicholson n. Bio. [John Joseph Nicholson] (b. 1937), a U.S. filmaker and Academy Award winning actor; Best Actor for One Flew Over The Cuckoo's Nest (1975), Best Supporting Actor for Terms Of Endearment (1983), and Best Actor for As Good As It Gets (1997). 

Jack Nicklaus n. Bio. "The Golden Bear" [Jack William Nicklaus] (b. 1940), a U.S. golfer; widely regarded as the greatest golfer of all time, winning a record 18 career major championships.

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Jacknife n. Film. a 1989 post-VietNam War U.S. drama film starring Robert DeNiro and Ed Harris.

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Jack Northrop Field n. Geog. [after Northrop Aircraft Corp. founder Jack Northrop] Hawthorne Municipal Airport (LOC ID : HHR), a public-use airport located one mile E of Hawthorne, Calif.

jacko also laughing jackass n. Austral. Slang. nickname for a kookaburra, a native Australian kingfisher (Dacelo gigas), having a loud, harsh cry that resembles laughter. 

jack oak n. 1. a common scrubby deciduous tree (Quercus marilandica), of SE U.S. with dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets : BLACKJACK; BLACKJACK OAK; SCRUB OAK. 2. a small to medium decidious oak (Quercus ellipsoidalis), of E central N America with leaves having sharp pointed lobes : NORTHERN PIN OAK.

jack-of-all-trades n. a person who is handy at many kinds of tasks : HANDYMAN. 

Jack Of Clubs Creek n. Geog. a creek located in the Cariboo region of British Columbia.

jack-off var. of jerk-off n. 1. someone who is rude or idiotic, especially a man; an annoying person or one who has committed a transgression with no apology. 2. a lazy person : LOAFER.

jack-off var. of jerk-off v. usu. considered vulgar. 1. to get sexual gratification through self-stimulation : MASTERBATE. 2. to do nothing; waste time.

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jack-o'-lantern n. 1. a hollowed-out pumpkin having a face cut in it often with a candle or light inside, usu. displayed at Halloween. 2. any phenomenon of light, as a corona discharge : IGNIS FATUUS; WILL O' THE WISP; SAINT ELMO'S FIRE. 3. a poisonous luminescent orange fungus (Omphalotus olearius), that grows in clusters at the base of tree stumps. 

jack-o'-lantern mushroom n. a poisonous orange gilled mushroom (Omphalotus olearius), which appears similar to some chanterelles.
 

Jack O'Legs n. Brit. Folklore. a giant and archer from Hertfordshire, England; like Robin Hood, said to have robbed from the rich to given to the poor.

jack of plate n. a type of armor comprising small iron plates sewn between layers of felt and canvas; similar to the brigandine, whereas the brigandine is riveted and the jack is sewn. 

Jack of the Clock also Jack o' the Clock n. an automaton or animated, mechanized figure of a person, usually made from wood or metal, which strikes the hours on a bell with a hammer; usually as part of clocks or clocktowers, and often near or at the top of the construction : QUARTER-JACK; JACQUEMART.

jack of the clock house n. MINUTE JACK.

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Jack of the dust also Jack-in-the-dust n. Military. an obsolete enlisted rating of the U.S. Navy Supply Corps; having its origin in the Royal Navy of the early 1800s when ship's stewards were known as "Jack-in-the-dust", referring to the atmosphere created by issuing quantities of flour and dried biscuits.

Jack of the Lantern n. JACK-O'-LANTERN, STINGY JACK.

jack out of doors n. Obsolete. a homeless person : VAGRANT. 

jack over v. to deceive or trick. 

Jack Paar n. Bio. [Jack Harold Paar] (1918-2004), a U.S. comedian; TV talk show host; best known for hosting The Tonight Show from 1957 to 1962.

 
Jack Palance n. Bio. [Volodymyr Palahniuk] (1919-2006), a U.S. actor and singer; Oscar for City Slickers (1962).

Jack Pardee n. Bio. [John Perry Pardee] (1936-2013), a U.S. Hall of Fame football linebacker, coach; the only head coach to helm a team in NCAA football, NFL, USFL, WFL, and the CFL. 

Jack PC n. Computer. a patented, thin client that can be fitted into walls, floors, or furniture and secured behind the faceplate, thus eliminating exposure to damage, disconnection, or theft.

jack pine n. a slender evergreen tree (Pinus banksiana), found east of the Rockies in North America : GREY PINE; SCRUB PINE. 

jack plane n. Carpentry. a general-purpose bench plane for rough surface smoothing. 

jack plug n. Electricity. a type of audio connector. 

Jack Poage Field n. Geog. [after local aviation showman Jack B. Poage] Carroll County Regional Airport (LOC ID : DMW), a public-use airport located three miles N of Westminster, MD; a reliever airport for the Baltimore-Washington (BWI) Intl. Airport. 

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jack post n. an adjustable steel post used in the construction trades for temporary support of ceilings, walls, and trenches (shoring).

jackpot or jack pot n. 1. a. Poker. a pot that accumulates until a player opens the betting with a pair of predetermined denomination, usually jacks or better. b. the cumulative stakes in any game; the top prize or reward. 2. Slang. to achieve a sensational success; have sudden luck. ~ hit the jackpot. 

Jackpot Airport n. Geog. Hayden Field (LOC ID : Ø6U), a public-use airport located E of Jackpot, Nev. 

Jackpot Junction Casino Hotel n. a casino and hotel complex located on the Lower Sioux Indian Reservation located along the southern bank of the Minnesota River in Redwood County, Minn.; just south of the city of Morton. 

Jack Pudding also jackpudding n. a buffoon or clown appearing in stage and street performances.

jack pump also pumpjack n. a reciprocating piston pump used to mechanically lift liquid out of a well if there is not enough bottom hole pressure for the liquid to flow to the surface, commonly used in oil well : NODDING DONKEY. 

Jack Pumpkinhead n. Lit. a fictional character from the Land of Oz and appears in several of the classic children's series of Oz books by U.S. author L. Frank Baum.

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jackrabbit n. a large, long-legged hare (Lepus), of western North America, with long ears resembling those of a donkey; six species include ~  antelope jackrabbit; ~ black-tailed jackrabbit; ~ white-sided jackrabbit; ~ Tehuantepec jackrabbit; ~ black jackrabbit; ~ white-tailed jackrabbit.

jack rafter also jack truss n. Carpentry. having a height or length less than that of most others in a structure. 

Jack Ranch Café n. a restaurant in Cholame, California on Hwy 46; a James Dean memorial monument is in front of the cafe.

Jack Reacher n. 1. Lit. a fictional character who appears in a series of more than 20 books by Brit. author Lee Child; Reacher is a former Army M.P. major who roams the U.S. taking odd jobs investigating suspicious and dangerous situations. 2. Film. Jack Reacher (2012) an action film based on the novel One Shot, starring Tom Cruise as the title character of the same name. 3. Film. Jack Reacher: Never Go Back (2016), sequel film based on the novel Never Go Back (2013). 

Jack "Hacksaw" Reynolds n. Bio. (b. 1947), a U.S. linebacker who played for the Univ. of Tenn., L.A. Rams, and San Francisco 49ers; won two Super Bowls (XVI and XIX).

Jack River n. Geog. 1. a perennial river located in the Australian state of Victoria. 2. a small settlement (pop. 301) in the Shire of Wellington in SW Gippsland, in the Australian state of Victoria.

jackrock n. an anti-personnel weapon made up of two or more sharp nails or spines arranged in such a manner that one of them always points upward from a stable base; served to slow the advance of horses, war elephants, camels, and human troops : CALTROP; CROW'S FOOT.

Jack Ruby n. Bio. [Jacob Leonard "Jack Leon" Rubenstein] (1911-1967), an U.S. nightclub owner who fatally shot Lee Harvey Oswald while Oswald was in police custody after being charged with assassinating U.S. President John F. Kennedy two days earlier.

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Jack Russell terrier also Jack Russell n. [after Devonshire clergyman & dog breeder Rev. John "Jack" Russell (1795-1883)], any of a breed of small, short-legged terriers having a white coat with tan, brown, or black markings.

Jack Ryan n. 1. Lit. a fictional character created by Tom Clancy who appears in many of his novels and their respective film adaptations; Ryan is a former U.S.M.C. officer who rose through the ranks of the CIA and conducted a variety of covert operations. 2. Film. Jack Ryan: Shadow Recruit (2014), an action spy thriller and the fifth in a series of films featuring fictional character Jack Ryan; starring Chris Pine, Kevin Costner, Kenneth Branagh, and Keira Knightley.

jack salmon n. 1. a young salmon after its first return from the sea : GRILSE. 2. a. a freshwater perciform fish (Sander vitreus), native to most lakes of Canada and the northern U.S. : WALLEYE. b. a freshwater perciform fish (Sander canadensis), of N America, found esp. in the rivers of the Tennessee Valley : SAUGER. 

Jack’s Back n. Film. a U.S. thriller (1988) about a serial killer in L.A. that celebrates Jack the Ripper's 100th birthday by committing similar murders; starring James Spader.

Jacksboro n. Geog. 1. a town (pop. 4,511) in N central Texas NE of Fort Worth, seat of Jack County. 2. a town (pop. 2,020) in NE Tenn., seat of Campbell County; foun. 1808.

Jacks Creek or Jack's Creek n. Geog. 1. an unincorporated village of W Tenn. 2. a tributary of the Juniata River in central Pennsylvania in the United States.

jackscrew n. SCREW JACK.

Jacks Fork River n. Geog. one of three rivers in Mo. that are part of the Ozark National Scenic Riverways system. 

Jack-Shack n. nickname for The Ector County Coliseum, multi-purpose arena in Odessa, Tex; home to the Odessa Jackalopes (hockey), the Sand Hills Rodeo, and the biennial Permian Basin International Oil Show.

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jackshaft n. 1. a short shaft that transmits motion from a motor or engine to a machine that is driven from it : COUNTERSHAFT. 2. a shaft on which an idle wheel or fairlead turns. 

Jack Shark Lake n. Geog. a lake located on Vancouver Island on the W side of Augerpoint Mountain.

jack shay n. Austral. Slang. a tin quart pot used for boiling water or cooking in the bush or outback.

Jack Sheppard n. Bio. (1702-24), a notorious English robber, burglar, and thief of 18th-century London; featured in the film Where's Jack (1969), based on his exploits. 

jack-sinker n. Knitting Mach. a thin iron plate operated by the jack to depress the loop of thread between two needles. 

Jack's Bay n. Geog. a small settlement in The Catlins on the SE corner of the South Island of New Zealand; noted for a large 55-meter deep blowhole, known as Jack's Blowhole, that formed when part of a sea cavern's roof collapsed; the bay, blowhole and nearby Tuhawaiki Island (sometimes called Jack's Island) are all named after Bloody Jack. 

Jack's Jump n. Geog. a subglacial volcano in E Central B.C., Canada.

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Jack Skellington n. Film. the main protagonist and "Pumpkin King" of Halloween Town in the The Nightmare Before Christmas (1993).

Jack's Family Restaurants also Jack's Hamburgers n. [after founder Jack Caddell] a fast-food restaurant chain located several SE states, established as a single walk-up stand in Homewood, Ala.; foun. 1960.

Jack's Land n. Brit. Folklore. any area of farmland that is left uncultivated due to either a perceived infertility or superstition : NO MAN’S LAND. 

Jack's Magazine n. (also known as the Saltwater River Gunpowder Magazine) a complex opened in 1878 to provide safe storage for bonded gunpowder and explosives imported into the colony of Victoria, located on the Maribyrnong River.

Jack's Mannequin n. a U.S. rock band hailing from Orange County, Calif. form. 2004.

jacksmelt n. a large silverside (Atherinopsis californienis), of the coast of California that grows to a length of 22 inches.

jacksmith n. a craftsman or blacksmith who makes jacks.

Jack Smithers n. Austral. Slang. a lone drinker. 

Jack's Mountain n. Geog. [after 18th-century fur trader Jack Armstrong] one of the tallest hills in the Falkland Islands; the site where Jack Armstrong was killed by Delaware Indians is known as Jack’s Narrows.

jacksnipe also jack snipe n. 1. a small, short-billed snipe (Limnocryptes minimus), of Europe or Asia. 2. any of several related snipes. 3. the pectoral sandpiper.

Jackson n. [the name Jackson. son of Jack.] 

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Jackson n. Geog. [refers to any one of several towns and villages located in the states of Ala., Calif., Ga., Ky., Me., Minn., Neb., N.C., N.H., N.Y., S.C., and Wis.] 1. a city (pop. 173,514) on the Pearl River in W central Miss.; state capital, most populous city, and seat of Hinds Co.; foun. 1833. 2. a city (pop. 65,211) in W Tenn.; seat of Madison Co.; foun. 1823 by a nephew of Andrew Jackson. 3. a city (pop. 36,316) on the Grand River in S central Mich. W of Ann Arbor; seat of Jackson Co.; foun. 1829. 4. a city (pop. 11,947) in SE Mo.; seat of Cape Girardeau Co. inc. 1853. 5. a town (pop. 8,647) in the Jackson Hole valley of NW Wyo.; seat of Teton Co. foun. 1901. 6. a city (pop. 6,184) in S central Ohio; seat of Jackson Co. est. 1817.

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Jackson n. Bio. [surname of several notable persons] 1. Alan [Alan Eugene] (b. 1958), a U.S. country singer, songwriter. 2. Andrew "Old Hickory" (1767-1845), a U.S. general and 7th president of the U.S. (1829-37). 3. "Bo" [Vincent Edward] (b. 1962), a U.S. professional baseball and football player. 4. Janet [Janet Damita Jo] (b. 1966), a U.S. singer, dancer, and entertainer; youngest child of the Jackson family. 5. Jesse [Jesse Louis, Sr.] (b. 1941), a U.S. Baptist minister; civil-rights and political activist. 6. "Shoeless" Joe [Joseph Jefferson] (1887-1951), a U.S. professional baseball player; part of the 1919 "Black Sox" scandal. 7. Kate [Catherine Elise] (b. 1949), a U.S. actress; Sabrina Duncan on Charlie's Angels. 8. Mahalia (1911-72), a U.S. gospel singer. i. Mary (1910-2005), a U.S. actress; Miss Emily Baldwin on The Waltons. 9. Maynard [Maynard Holbrook, Jr.] (1938-2003), a U.S. politician; former mayor of Atlanta. 10. Michael "King of Pop" [Micheal Joseph] (1958-2009), a U.S. singer and entertainer; former member of the Jackson Five. 11. O'Shea "Ice Cube" (b. 1959), a U.S. rap musician, actor, and producer. 12. Phil [Philip Douglas] (b. 1945), a U.S. basketball player and NBA coach; coached the Chicago Bulls (1989-98) and L.A. Lakers (1999-2004). 13. Reggie "Mr. October" [Reginald Martinez] (b. 1946), a U.S. professional baseball player; Member of the National Baseball Hall of Fame. 14. Samuel L. [Samuel Leroy] (b. 1948), a U.S. film and TV actor; Jules Winnfield in Pulp Fiction (1994). 15. "Scoop" [Henry Martin] (1912-83), a U.S. politician; U.S. Rep. and U.S. Sen., (D) Wash. 16. "Stonewall" [Thomas Jonathan] (1824-63), a Confederate general. 

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Jackson Browne n. Bio. [Clyde Jackson Browne] (b. 1948), a U.S. singer, songwriter, and musician.

Jackson Center n. Geog. 1. a village (pop, 1,369) in W. Ohio; home of Airstream travel trailers and motor homes. 2. a borough (pop. 221) in NW Penn. near Youngstown, Ohio. est. 1882.

Jackson College n. Edu. 1. [after Cornelia Maria Jackson, who bequeathed funds to Tufts Univ. to help "remove the disabilities of women"] a private women's college in Medford, Mass.; foun. 1910, now part of Tufts University. 2. Jackson Community College is a public college located in Jackson, Mich.; foun. 1928 as Jackson Junior College. 3. Jackson State Community College is a public college located in Jackson, Tenn.; foun. 1965. 4. Jackson State University is a historically black, public university located in Jackson, Miss.; foun. 1877.

Jackson County n. Geog. refers to any one of several U.S. counties, located in the states of Ala., Ark., Colo., Fla., Ga., Ill., Ind., Iowa, Kan., Ky., Mich., Minn., Miss., Mo., N.C., Ohio, Okla., Ore., S.D., Tenn., Tex., Wis., and W.Va.

Jackson Day n. U.S. January 8 celebrated as a legal holiday in Louisiana commemorating the Battle of New Orleans in 1815.

Jackson Hewitt Tax Service, Inc. n. [after co-founders Melva Jackson and John Hewitt] a U.S. tax return preparation service company, foun. 1960. NYSE : JTX.

Jackson Hill n. Geog. an unincorporated town in SE Ind. near Terre Haute. 

Jackson Hole n. Geog. a valley in Wyo. between the Teton Mountain Range and the Gros Ventre Range; the term "hole" was used by early trappers who primarily entered the valley from the N and E and had to descend along relatively steep slopes, giving the sensation of entering a hole.

Jacksonian n. a follower of Andrew Jackson or his ideas.

Jacksonian adj. relating to Andrew Jackson, his politics, or his era.

Jackson Junction n. Geog. a city (pop. 60) in NE Iowa.

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Jackson Northman Anderson n. Bio. (1922-2005), a U.S. Pulitzer Prize winning newspaper columnist; considered one of the fathers of modern investigative journalism.

Jackson Parish n. a U.S. parish located in Louisiana. 

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Jackson Pollock n. Bio. [Paul Jackson Pollock] (1912-56) a U.S. painter and major figure in the abstract expressionist movement; well known for his unique style of drip painting.

Jackson Prairie crayfish n. a species of crayfish (Procambarus barbiger), in the family Cambaridae; endemic to the Jackson Prairie area of Miss.

Jacksons' Arm n. Geog. a town (pop. 374) located in the Canadian province of Newfoundland and Labrador on White Bay. foun. 1870.

Jacksons' Gap n. Geog. a town (pop. 761) in E. Central Ala.; known for its annual Pioneer Day.

Jackson's playboy n. a butterfly (Deudorix jacksoni), in the Lycaenidae family, found in Africa; the habitat consists of the ecotone between forests and savanna, especially riverine vegetation. 

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Jackson "Jax" Teller n. TV. [Jackson Nathaniel Teller] a fictional character on the FX series Sons of Anarchy, portrayed Charlie Hunnam; President of the Sons of Anarchy Motorcycle Club's Redwood Original (SAMCRO) mother chapter based in Charming, Calif.

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Jacksonville n. Geog. 1. a seaport city (pop. 794,555) in NE Fla. on the St. Johns River near the Ga border; seat of Duval Co. foun. 1791 as Cowford. 2. a city (pop. 69,688), in SE N.C. near the Atlantic NE of Wilmington; seat of Onslow Co.; home of U.S. Marine Corps' Camp Lejeune. foun. 1757. 3. a city (pop. 31,190) in central Ark.; home of Little Rock AFB. foun. 1870. 4. a city (pop. 18,940) in W central Ill. W of Springfield; seat of Morgan Co. foun. 1825. 5. a city (pop. 13,868) in E Tex. SE of Dallas. foun. 1847 as Gum Creek. 6. also refers to any one of several towns and villages located in the states of Ala., Ga., Mo., Ore., Penn., and Vt. 

Jacksonville Air Route Traffic Control Center (ZJX) n. an en route air traffic control center for U.S. airspace operated by the FAA, located in Hilliard, Fla.

Jacksonville Beach n. Geog. a city in NE Florida on the Atlantic near Jacksonville.

Jacksonville College n. Edu. 1. a private two-year liberal arts Christian college located in Jacksonville, Tex. 2. Jacksonville Univ. is a private coed university located in Jacksonville, Fla.; foun. 1934. 3. Jacksonville State University is a public university located in Jacksonville, Ala. foun. 1883. 

Jacksonville Correctional Center n. a minimum-security state prison for men located in Jacksonville, Ill. operated by the Illinois Department of Corrections.

Jacksonville International Airport n. Geog. (LOC ID : JAX), a civil-military public-use airport located 13 miles N of Jacksonville, Fla.

Jacksonville Jaguars n. a professional NFL football team located in Jacksonville, Fla. 

Jacksonville Naval Air Station also NAS Jacksonville-Towers Field n. Geog. (LOC ID : NIP), a military airport located eight miles S of Jacksonville, Fla.

Jackson Whites n. name applied to a group of people of mixed descent (African, European, and Native American) living in the Ramapo Mts. along the New Jersey-New York state line.

Jack Soo n. Bio. [Goro Suzuki] (1916-79), a U.S. actor; best known as Det. Nick Yemana in the TV sitcom Barney Miller. 

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Jack Sparrow n. a fictional main character in the Pirates of the Caribbean film series; portrayed by Johnny Depp.

Jack's Place n. 1. [after founder Jack Hunt] a Western-styled restaurant chain HQ in Orlando, Fla.; foun. 1966. 2. TV. a U.S. drama series that aired on ABC (1992-93); starring Hal Linden as a retired jazz musician named Jack Evans who runs a restaurant where romances tend to start. 

Jack Sport n. a French automobile manufactured in Paris from 1925 to 1930 M. Corbeau.

Jack Sprat n. a nursery rhyme character, who could eat no fat.

jack staff n. a flagstaff at the bow of a vessel, on which a jack is flown. 

jack staff also jackstaff n. Naut. a small vertical spar or pole on the bow of a ship on which a flag, known as a jack, is flown.

jack stand n. an adjustable safety device used to hold a vehicle up after it has been raised.

jackstay n. Naut. 1. a stay for racing or cruising vessels used to steady the mast against the strain of the gaff. 2. a rope, rod, or batten along a ship's yard to which the sail is fastened. 3. a rope or rod running up the forward side of the mast on which the yard moves.