Ace in the hole

noun, slang

Definitions

Noun
  1. 1
    Synonym of ace up one's sleeve. US, idiomatic, informal

    "Our ace in the hole left our opponents stupefied; it isn't every day that an NBA star plays street basketball."

Etymology

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

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