ace in the hole

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From stud poker in which there is one unknown card called the "hole card;" referring to the optimum "hole card" being an ace.


ace in the hole ‎(plural aces in the hole)

  1. (idiomatic, US, informal) A hidden or secret strength, or unrevealed advantage.
    Our ace in the hole left our opponents stupefied; it isn't every day that an NBA star plays street basketball.


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