American English

Definition of jack noun from the Oxford Advanced American Dictionary



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  1. 1[countable] a device for raising heavy objects off the ground, especially vehicles, so that a wheel can be changed
  2. 2[countable] an electronic connection between two pieces of electrical equipment
  3. 3[countable] (in a deck of cards) a card with a picture of a young man on it, worth more than a ten and less than a queen the jack of clubs
  4. 4jacks [plural] a children's game in which players bounce a small ball and pick up small metal objects, also called jacks, before catching the ball see also blackjack, flapjack, Union Jack
  5. Idioms
    all work and no play (makes Jack a dull boy) (saying)
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    it is not healthy to spend all your time working; you need to relax too
    a jack of all trades
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    a person who can do many different types of work, but who perhaps does not do them very well
See the Oxford Advanced Learner's Dictionary entry: jack