jacked off

WordReference Random House Learner's Dictionary of American English © 2026

jack¹ /dʒæk/   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.

v. 

5. 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.
6. Informal Terms to increase, raise, or accelerate (prices, wages, speed, etc.): [~ + up + object]
   The landlord jacked up rent illegally.
   [~ + object + up]
   They jacked oil prices up.

Idioms

7. every man jack, everyone without exception:
   The killers managed to escape, every man jack.

WordReference Random House Unabridged Dictionary of American English © 2026

jack¹  ( jak), n. 

1. any of various portable devices for raising or lifting heavy objects short heights, using various mechanical, pneumatic, or hydraulic methods.
2. Games Also called knave. [Cards.] a playing card bearing the picture of a soldier or servant.
3. Electricity a connecting device in an electrical circuit designed for the insertion of a plug.
4. Informal Terms (cap.) fellow;
   buddy;
   man (usually used in addressing a stranger):
   Hey, Jack, which way to Jersey?
5. Games Also 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. Fish any of several carangid fishes, esp. of the genus Caranx, as C. hippos (crevalle jack or jack crevalle,) of the western Atlantic Ocean.
7. Slang Terms money:
   He won a lot of jack at the races.
8. Nautical
   • Naval Terms a small flag flown at the jack staff of a ship, bearing a distinctive design usually symbolizing the nationality of the vessel.
   • Naval Terms Also 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. Wine applejack.
12. Mammals See 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. Time Also called clock jack. [Horol.] a mechanical figure that strikes a clock bell.
19. Fish a 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. Idioms every man jack, everyone without exception:
    They presented a formidable opposition, every man jack of them.

v.t. 

23. 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.
24. Informal Terms to increase, raise, or accelerate (prices, wages, speed, etc.) (usually fol. by up).
25. Informal Terms to boost the morale of;
    encourage (usually fol. by up).
26. to jacklight.

v.i. 

27. to jacklight.
28. Slang Terms jack off, Slang (vulgar). to masturbate.

adj. 

29. 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), n. 

1. Plant Biology jackfruit.

• Malayalam cakka
• Portuguese jaca
• 1605–15

jack³  ( jak), 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), n. 

1. a male given name, form of Jacob or John.