American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Keep your mouth shut


Stop talking. Remain silent, especially about a secret or an illegal activity. A shut mouth does not speak, so this phrase admonishes one to not be vocal. It is also a command by an authority figure to stop your needless talking. (Compare to Shut up, Shut your trap or Hold your tongue.)

“I was going to tell the neighbor we accidentally broke his window, but my friend told me to keep my mouth shut.”

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