UK:*UK and possibly other pronunciationsUK and possibly other pronunciations'jack', 'Jack': /ˈdʒæk/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/dʒæk/ ,USA pronunciation: respelling( jak)

WordReference Random House Learner's Dictionary of American English © 2020
jack1 /dʒæk/USA pronunciation   n. 
  1. Mechanical Engineering any of various portable devices for raising or lifting heavy objects a short distance off the ground:[countable]an automobile jack.
  2. Games Also called knave. a playing card with the picture of a soldier or servant:[countable]a pair of jacks.
  3. Electricity a connecting device in an electrical circuit designed so that a plug can be attached to it:[countable]a telephone jack.
  4. Games
    • [countable] one of a set of small, six-pointed metal objects or pebbles used in the game of jacks.
    • jacks, [uncountable;  used with a singular verb] a children's game in which a player tosses and gathers these objects usually while bouncing a small rubber ball.

  1. to lift or move (something) with or as if with a jack: [+ object]to jack the car on the soft grass.[+ up + object]to jack up a car.[+ object + up]to jack it up.
  2. Informal Termsto increase, raise, or accelerate (prices, wages, speed, etc.): [+ up + object]The landlord jacked up rent illegally.[+ object + up]They jacked oil prices up.
  1. every man jack, everyone without exception:The killers managed to escape, every man jack.

WordReference Random House Unabridged Dictionary of American English © 2020
jack1  ( jak),USA pronunciation n. 
  1. any of various portable devices for raising or lifting heavy objects short heights, using various mechanical, pneumatic, or hydraulic methods.
  2. GamesAlso called  knave. [Cards.]a playing card bearing the picture of a soldier or servant.
  3. Electricitya connecting device in an electrical circuit designed for the insertion of a plug.
  4. Informal Terms(cap.) fellow;
    man (usually used in addressing a stranger):Hey, Jack, which way to Jersey?
  5. GamesAlso called  jackstone. 
    • one of a set of small metal objects having six prongs, used in the game of jacks.
    • one of any other set of objects, as pebbles, stones, etc., used in the game of jacks.
    • jacks, (used with a sing. v.) a children's game in which small metal objects, stones, pebbles, or the like, are tossed, caught, and moved on the ground in a number of prescribed ways, usually while bouncing a rubber ball.
  6. Fishany of several carangid fishes, esp. of the genus Caranx, as C. hippos(crevalle jack or jack crevalle), of the western Atlantic Ocean.
  7. Slang Termsmoney:He won a lot of jack at the races.
  8. Nautical
    • Naval Termsa small flag flown at the jack staff of a ship, bearing a distinctive design usually symbolizing the nationality of the vessel.
    • Naval TermsAlso called  jack crosstree. either of a pair of crosstrees at the head of a topgallant mast, used to hold royal shrouds away from the mast.
  9. Naval Terms(cap.) a sailor.
  10. a lumberjack.
  11. Wineapplejack.
  12. MammalsSee  jack rabbit. 
  13. a jackass.
  14. jacklight.
  15. a device for turning a spit.
  16. 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.
  17. Sport[Lawn Bowling.]a small, usually white bowl or ball used as a mark for the bowlers to aim at.
  18. TimeAlso called  clock jack. [Horol.]a mechanical figure that strikes a clock bell.
  19. Fisha premigratory young male salmon.
  20. Show Business[Theat.]See  brace jack. 
  21. Sport[Falconry.]the male of a kestrel, hobby, or esp. of a merlin.
  22. Idiomsevery man jack, everyone without exception:They presented a formidable opposition, every man jack of them.

  1. to lift or move (something) with or as if with a jack (usually fol. by up):to jack a car up to change a flat tire.
  2. Informal Termsto increase, raise, or accelerate (prices, wages, speed, etc.) (usually fol. by up).
  3. Informal Termsto boost the morale of;
    encourage (usually fol. by up).
  4. to jacklight.

  1. to jacklight.
  2. Slang Termsjack off, Slang (vulgar). to masturbate.

  1. Building[Carpentry.]having a height or length less than that of most of the others in a structure;
    cripple:jack rafter; jack truss.
  • 1350–1400; Middle English jakke, Jakke used in addressing any male, esp. a social inferior, variant of Jakken, variant of Jankin, equivalent. to Jan John + -kin -kin; extended in sense to anything male, and as a designation for a variety of inanimate objects

jack2  ( jak),USA pronunciation n. 
  1. Plant Biologyjackfruit.
  • Malayalam cakka
  • Portuguese jaca
  • 1605–15

jack3  ( jak),USA pronunciation n. 
  1. a defensive coat, usually of leather, worn in medieval times by foot soldiers and others.
  2. a container for liquor, originally of waxed leather coated with tar.
  • Middle French jaque(s), jacket, short, plain upper garment, probably after jacques peasant (see Jacquerie)
  • Middle English jakke 1325–75

Jack  ( jak),USA pronunciation n. 
  1. a male given name, form of  Jacob or  John. 

Collins Concise English Dictionary © HarperCollins Publishers::
jack /dʒæk/ n
  1. a man or fellow
  2. a sailor
  3. the male of certain animals, esp of the ass or donkey
  4. a mechanical or hydraulic device for exerting a large force, esp to raise a heavy weight such as a motor vehicle
  5. any of several mechanical devices that replace manpower, such as a contrivance for rotating meat on a spit
  6. one of four playing cards in a pack, one for each suit, bearing the picture of a young prince; knave
  7. a small usually white bowl at which the players aim with their own bowls
  8. a female socket with two or more terminals designed to receive a male plug (jack plug) that either makes or breaks the circuit or circuits
  9. a flag, esp a small flag flown at the bow of a ship indicating the ship's nationality
  10. a part of the action of a harpsichord, consisting of a fork-shaped device on the end of a pivoted lever on which a plectrum is mounted
  11. any of various tropical and subtropical carangid fishes, esp those of the genus Caranx, such as C. hippos (crevalle jack)
  12. Also called: jackstone one of the pieces used in the game of jacks
  13. US
    a slang word for money
  14. every man jackeveryone without exception
  15. the jackAustral slang venereal disease
  1. jack ofAustral slang tired or fed up with (something)
vb (transitive)
  1. to lift or push (an object) with a jack

See also jack in, jack upEtymology: 16th Century jakke, variant of Jankin, diminutive of John
Collins Concise English Dictionary © HarperCollins Publishers::
Jack /dʒæk/ n
  1. I'm all right, JackBrit informal a remark indicating smug and complacent selfishness
'jack' also found in these entries:
Collocations: [buy, use, need] a jack plug, a [headphone, Ethernet, telephone] jack, cards: the jack of [diamonds, hearts, clubs, spades], more...

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