smoking gun
noun/ˌsməʊkɪŋ ˈɡʌn/
/ˌsməʊkɪŋ ˈɡʌn/
[singular] (informal)- something that seems to prove that somebody has done something wrong or illegal
- This memo could be the smoking gun that investigators have been looking for.
- There's no smoking gun that they have found to date.
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smoking gun