| amberjack | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberfish |
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| applejack | (noun) distilled from hard cider | - |
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| blackjack | (noun) a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21 | Synonyms: twenty-one, vingt-et-un |
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| (noun) a piece of metal covered by leather with a flexible handle; used for hitting people | Synonyms: cosh, sap |
| (noun) a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship | Synonyms: black flag, Jolly Roger, pirate flag |
| (noun) a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets | Synonyms: blackjack oak, jack oak, Quercus marilandica |
| (verb) exert pressure on someone through threats | Synonyms: blackmail, pressure |
| bluejacket | (noun) a serviceman in the navy | Synonyms: navy man, sailor, sailor boy |
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| bootjack | (noun) has V-shaped notch for pulling off boots | - |
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| carjack | (verb) take someone's car from him by force, usually with the intention of stealing it | - |
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| carjacking | (noun) the violent theft of an occupied car | - |
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| cheapjack | (adjective) made of inferior workmanship and materials | Synonyms: shoddy, tawdry |
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| (noun) a peddler of inferior goods | - |
| crackerjack | (noun) something excellent of its kind | Synonyms: jimdandy, jimhickey |
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| (noun) someone excellent of their kind | Synonyms: jimdandy, jimhickey |
| crossjack | (noun) the lowermost sail on a mizzenmast | Synonyms: mizzen course |
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| flapjack | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: battercake, flannel-cake, flannel cake, flapcake, griddlecake, hot cake, hotcake, pancake |
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| highjack | (noun) seizure of a vehicle in transit either to rob it or divert it to an alternate destination | Synonyms: hijack |
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| (verb) take arbitrarily or by force | Synonyms: commandeer, hijack, pirate |
| highjacker | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highwayman, hijacker, road agent |
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| (noun) someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination | Synonyms: hijacker |
| highjacking | (noun) robbery of a traveller or vehicle in transit or seizing control of a vehicle by the use of force | Synonyms: hijacking |
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| hijack | (noun) seizure of a vehicle in transit either to rob it or divert it to an alternate destination | Synonyms: highjack |
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| (verb) take arbitrarily or by force | Synonyms: commandeer, highjack, pirate |
| (verb) seize control of | - |
| hijacker | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highjacker, highwayman, road agent |
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| (noun) someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination | Synonyms: highjacker |
| hijacking | (noun) robbery of a traveller or vehicle in transit or seizing control of a vehicle by the use of force | Synonyms: highjacking |
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| jack | (noun) any of several fast-swimming predacious fishes of tropical to warm temperate seas | - |
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| (noun) male donkey | Synonyms: jackass |
| (noun) tool for exerting pressure or lifting | - |
| (noun) one of four face cards in a deck bearing a picture of a young prince | Synonyms: knave |
| (noun) small flag indicating a ship's nationality | - |
| (noun) game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks | Synonyms: jackstones |
| (noun) an electrical device consisting of a connector socket designed for the insertion of a plug | - |
| (noun) a small ball at which players aim in lawn bowling | - |
| (noun) immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted | Synonyms: jackfruit, jak |
| (noun) someone who works with their hands; someone engaged in manual labor | Synonyms: laborer, labourer, manual laborer |
| (noun) a small worthless amount | Synonyms: diddley, diddly-shit, diddly-squat, diddly, diddlyshit, diddlysquat, doodly-squat, shit, squat |
| (verb) hunt with a jacklight | Synonyms: jacklight |
| (verb) lift with a special device | Synonyms: jack up |
| jackal | (noun) Old World nocturnal canine mammal closely related to the dog; smaller than a wolf; sometimes hunts in a pack but usually singly or as a member of a pair | - |
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| (noun) a jackal native to Europe and Asia with a golden coat | Synonyms: Canis aureus, golden jackal |
| (noun) a jackal native to Africa with a black back | Synonyms: black-backed jackal, Canis mesomelas |
| (noun) a jackal native to Southern Africa with a stripe down its side | Synonyms: Canis adustus, side-striped jackal |
| (noun) a canid living in the deserts of Northern Africa related to the goldn jackal and the grey wolf | Synonyms: African golden wolf, Canis anthus, Egyptian jackal, grey jackal |
| jackanapes | (noun) someone who is unimportant but cheeky and presumptuous | Synonyms: lightweight, whippersnapper |
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| jackass | (noun) male donkey | Synonyms: jack |
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| (noun) a man who is a stupid incompetent fool | Synonyms: bozo, cuckoo, fathead, goof, goofball, goose, twat, zany |
| jackboot | (noun) (19th century) a man's high tasseled boot | Synonyms: hessian, Hessian boot, Wellington, Wellington boot |
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| jackdaw | (noun) common black-and-grey Eurasian bird noted for thievery | Synonyms: Corvus monedula, daw |
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| jacket | (noun) a short coat | - |
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| (noun) an outer wrapping or casing | - |
| (noun) (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth | Synonyms: cap, crown, crownwork, jacket crown |
| (noun) the tough metal shell casing for certain kinds of ammunition | - |
| (noun) the outer skin of a potato | - |
| (verb) put a jacket on | - |
| (verb) provide with a thermally non-conducting cover | - |
| jackfruit | (noun) immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted | Synonyms: jack, jak |
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| (noun) East Indian tree cultivated for its immense edible fruit and seeds | Synonyms: Artocarpus heterophyllus, jackfruit tree |
| jackhammer | (noun) a hammer driven by compressed air | Synonyms: air hammer, pneumatic hammer |
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| jackknife | (noun) a dive in which the diver bends to touch the ankles before straightening out | - |
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| (noun) a large knife with one or more folding blades | Synonyms: clasp knife |
| (verb) dive into the water bending the body at the waist at a right angle, like a jackknife | - |
| jacklight | (noun) a light used as a lure in hunting or fishing at night | - |
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| (verb) hunt with a jacklight | Synonyms: jack |
| jackpot | (noun) the cumulative amount involved in a game (such as poker) | Synonyms: kitty, pot |
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| (noun) any outstanding award | - |
| jackrabbit | (noun) large hare of western North America | - |
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| (verb) go forward or start with a fast, sudden movement | - |
| jacks | (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball | Synonyms: jackstones, knucklebones |
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| jackscrew | (noun) screw-operated jack | Synonyms: screw jack |
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| jacksmelt | (noun) a relatively large silversides of the Pacific coast of North America (known to reach 18 inches in length) | Synonyms: Atherinopsis californiensis |
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| jacksnipe | (noun) American sandpiper that inflates its chest when courting | Synonyms: Calidris melanotos, pectoral sandpiper |
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| (noun) a small short-billed Old World snipe | Synonyms: half snipe, Limnocryptes minima |
| jackstones | (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball | Synonyms: jacks, knucklebones |
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| (noun) game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks | Synonyms: jack |
| jackstraw | (noun) a thin strip of wood used in playing the game of jackstraws | Synonyms: spillikin |
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| jackstraws | (noun) a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others | Synonyms: spillikins |
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| leatherjack | (noun) any of several New World tropical fishes having tiny embedded scales | Synonyms: leatherjacket |
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| leatherjacket | (noun) any of several brightly colored tropical filefishes | Synonyms: leatherfish |
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| (noun) any of several New World tropical fishes having tiny embedded scales | Synonyms: leatherjack |
| (noun) tough-skinned larva of certain crane flies | - |
| lumberjack | (noun) a short warm outer jacket | Synonyms: lumber jacket |
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| (noun) a person who fells trees | Synonyms: faller, feller, logger, lumberman |
| natterjack | (noun) common brownish-yellow short-legged toad of western Europe; runs rather than hops | Synonyms: Bufo calamita |
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| skipjack | (noun) oceanic schooling tuna of considerable value in Pacific but less in Atlantic; reaches 75 pounds; very similar to if not the same as oceanic bonito | Synonyms: Euthynnus pelamis, skipjack tuna |
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| (noun) medium-sized tuna-like food fish of warm Atlantic and Pacific waters; less valued than tuna | Synonyms: Atlantic bonito, Sarda sarda |
| (noun) able to right itself when on its back by flipping into the air with a clicking sound | Synonyms: click beetle, snapping beetle |
| skyjack | (verb) subject an aircraft to air piracy | - |
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| steeplejack | (noun) someone who builds or maintains very tall structures | - |
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| straightjacket | (noun) a garment similar to a jacket that is used to bind the arms tightly against the body as a means of restraining a violent person | Synonyms: straitjacket |
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| straitjacket | (noun) a garment similar to a jacket that is used to bind the arms tightly against the body as a means of restraining a violent person | Synonyms: straightjacket |
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| (noun) anything immaterial that severely hinders or confines | - |
| supplejack | (noun) walking stick made from the wood of an American tropical vine | - |
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