Simple Definition of smoking gun
: 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)
Examples of smoking gun in a sentence
This document is the smoking gun that proves that he was lying.
First Known Use of smoking gun
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
Seen and Heard
What made you want to look up smoking gun? Please tell us where you read or heard it (including the quote, if possible).