keep one's mouth shut
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Be quiet; don't reveal confidential information. For example, The teachers told us to keep our mouths shut during the entire presentation, or You can't tell Carol anything; she's incapable of keeping her mouth shut. Also see hold one's tongue.
QUIZ
WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?
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Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.
Words nearby keep one's mouth shut
The American Heritage® Idioms Dictionary
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