jack in WordNet English dictionary

1. a small worthless amount
   "you don't know jack"
   jack  doodly-squat  diddly-squat  diddlysquat  diddly-shit  diddlyshit  diddly  diddley  squat  shit 
   
2. any of several fast-swimming predacious fishes of tropical to warm temperate seas
   jack 
   
3. male donkey
   jack  jackass 
   
4. tool for exerting pressure or lifting
   jack 
   
5. one of four face cards in a deck bearing a picture of a young prince
   jack  knave 
   
6. small flag indicating a ship's nationality
   jack 
   
7. 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
   jack  jackstones 
   
8. an electrical device consisting of a connector socket designed for the insertion of a plug
   jack 
   
9. a small ball at which players aim in lawn bowling
   jack 
   
10. immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted
    jackfruit  jak  jack 
    
11. someone who works with their hands; someone engaged in manual labor
    laborer  manual laborer  labourer  jack 
    

1. hunt with a jacklight
   jacklight  jack 
   
2. lift with a special device
   "jack up the car so you can change the tire"
   jack  jack up