keep one's mouth shut

Idioms & Phrases

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 Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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WordNet
keep one's mouth shut

verb
refrain from divulging sensitive information; keep quiet about confidential information; "Don't tell him any secrets--he cannot keep his mouth shut!" [syn: keep quiet] [ant: babble
WordNet® 3.0, © 2006 by Princeton University.
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Idioms & Phrases
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