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keep one's mouth shut

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
The American HeritageĀ® Idioms Dictionary
Copyright Ā© 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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