1. (noun) jack, doodly-squat, diddly-squat, diddlysquat, diddly-shit, diddlyshit, diddly, diddley, squat, shit
a small worthless amount
"you don't know jack"
2. (noun) mariner, seaman, tar, Jack-tar, Jack, old salt, seafarer, gob, sea dog
a man who serves as a sailor
3. (noun) laborer, manual laborer, labourer, jack
someone who works with their hands; someone engaged in manual labor
4. (noun) jackfruit, jak, jack
immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted
5. (noun) jack
a small ball at which players aim in lawn bowling
6. (noun) jack
an electrical device consisting of a connector socket designed for the insertion of a plug
7. (noun) jack, jackstones
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
8. (noun) jack
small flag indicating a ship's nationality
9. (noun) jack, knave
one of four face cards in a deck bearing a picture of a young prince
10. (noun) jack
tool for exerting pressure or lifting
11. (noun) jack
any of several fast-swimming predacious fishes of tropical to warm temperate seas
12. (verb) jack, jackass
male donkey
13. (verb) jack, jack up
lift with a special device
"jack up the car so you can change the tire"
14. (verb) jacklight, jack
hunt with a jacklight
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Definition of 'jack' 
