ace in the hole
phrase
as in coup de grace
something (as a fact or argument) that is decisive or overwhelming
The security camera footage was the ace in the hole for winning the case.
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“Ace in the hole.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/ace%20in%20the%20hole. Accessed 25 Apr. 2024.
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Merriam-Webster unabridged
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