Dictionary
smoking gun
noun
: a piece of evidence that clearly proves who did something or shows how something happened
Full Definition of SMOKING GUN
: something that serves as conclusive evidence or proof (as of a crime or scientific theory)
See smoking gun defined for English-language learners
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First Known Use of SMOKING GUN
1974
Rhymes with SMOKING GUN
Acheron, Algonquin, allemande, all-or-none, Balzacian, give the gun, hit-and-run, jump the gun, machine-gun, machine gun, megaton, midnight sun, one-on-one, one-to-one, on the run, overrun, pellet gun, radar gun, ride shotgun, riot gun, run-and-gun, Sally Lunn, scattergun, tommy gun, twenty-one, underdone, underrun, water gun
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