keep one's mouth shut

idiom

Definition of keep one's mouth shut

1 : to not say anything When he starts talking about politics, I just keep my mouth shut.
2 : to not talk about something (such as a secret) She told me to keep my mouth shut about the news. I never tell him anything important because he doesn't know how to keep his mouth shut.

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Nglish: Translation of keep one's mouth shut for Spanish Speakers

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