The Alternative English Dictionary: ace in the hole

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Entry definition

ace in the hole etymology From stud poker in which there is one unknown card called the "hole card;" referring to the optimum "hole card" being an ace.
noun: {{en-noun}}
  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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