keep one's mouth shut

1. 1.

   refrain from divulging sensitive information; keep quiet about confidential information

   “Don't tell him any secrets--he cannot keep his mouth shut!”

   Synonymskeep quietshut one's mouth

Questions about keep one's mouth shut

What does keep one's mouth shut mean?

keep one's mouth shut means "refrain from divulging sensitive information; keep quiet about confidential information".

What is another word for keep one's mouth shut?

Close synonyms include keep quiet, shut one's mouth. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is keep one's mouth shut a common word?

keep one's mouth shut is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.