I heard the phrase "ace in the hole" in a podcast; it is a weapon for which there is no defense.

Could somebody suggest alternative idiomatic phrases for "ace in the hole", which have the same ring/wittiness (for the lack of a better word), which native English speakers use in everyday conversations.


When the debate got heated, John used his ace in the hole against Jane, that Jane was in jail for fraud, and has no credibility.


1 Answer 1


One might use:

John used his sure advantage/advantage against Jane

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