Definitions for keep one's mouth shut
keep quiet, shut one's mouth, 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!"
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"keep one's mouth shut." Definitions.net. STANDS4 LLC, 2013. Web. 18 Jun 2013. <http://www.definitions.net/definition/keep one's mouth shut>.