Definition of ace noun from the Oxford Advanced American Dictionary



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  1. 1a playing card with a large single symbol on it, which has either the highest or the lowest value in a particular card game the ace of spades/hearts/diamonds/clubs
  2. 2(informal) a person who is very good at doing something a soccer/flying ace an ace marksman
  3. 3(in tennis) a serve (= the first hit) that is so good that your opponent cannot reach the ball He served 20 aces in the match.
  4. Idioms
    an ace in the hole(informal)
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    a secret advantage, for example a piece of information or a skill, that you are ready to use if you need to
    hold all the aces
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    to have all the advantages in a situation The union soon realized that the management held all the aces.
    play your ace
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    to use your best argument, etc. in order to get an advantage in a situation
See the Oxford Advanced Learner's Dictionary entry: ace

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