Definition of smoking gun
: something that serves as conclusive evidence or proof (as of a crime or scientific theory)
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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
1974
SMOKING GUN Defined for English Language Learners
smoking gun
Definition of smoking gun for English Language Learners
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: a piece of evidence that clearly proves who did something or shows how something happened
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