Meaning of SHUT ONE'S MOUTH

WordNet Dictionary
	Definition:		[v]  refrain from divulging sensitive information; keep quiet about confidential information; "Don't tell him any secrets--he cannot keep his mouth shut!"
	Synonyms:		keep one's mouth shut, keep quiet
	Antonyms:		babble, babble out, blab, blab out, peach, sing, talk, tattle