keep one's mouth shut


Also found in: Dictionary, Thesaurus.
Related to keep one's mouth shut: Shut Mouth

keep (one's) mouth shut

To not discuss or mention something. He needs to keep his mouth shut and stop telling our family secrets to everyone in town!
See also: keep, mouth, shut

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.
See also: keep, mouth, shut