What is the meaning of jacks?

noun

• A small worthless amount.
  • usage: "you don't know jack"
  • synonyms: jack, doodly-squat, diddly-squat, diddlysquat, diddly-shit, diddlyshit, diddly, diddley, squat, shit
• A man who serves as a sailor.
  • synonyms: mariner, seaman, tar, Jack-tar, Jack, old salt, seafarer, gob, sea dog
• Someone who works with their hands; someone engaged in manual labor.
  • synonyms: laborer, manual laborer, labourer, jack
• Immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted.
  • synonyms: jackfruit, jak, jack
• A small ball at which players aim in lawn bowling.
  • synonyms: jack
• An electrical device consisting of a connector socket designed for the insertion of a plug.
  • synonyms: jack
• 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, jackstones
• Small flag indicating a ship's nationality.
  • synonyms: jack
• One of four face cards in a deck bearing a picture of a young prince.
  • synonyms: jack, knave
• Tool for exerting pressure or lifting.
  • synonyms: jack
• Any of several fast-swimming predacious fishes of tropical to warm temperate seas.
  • synonyms: jack
• Male donkey.
  • synonyms: jack, jackass
• A game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball.
  • synonyms: jackstones, knucklebones

verb

• Lift with a special device.
  • usage: "jack up the car so you can change the tire"
  • synonyms: jack, jack up
• Hunt with a jacklight.
  • synonyms: jacklight, jack