keep mum

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keep mum (third-person singular simple present keeps mum, present participle keeping mum, simple past and past participle kept mum)

1. (idiomatic) To refrain from talking, especially to remain silent about something that may be sensitive or secret.
   • c. 1940, British wartime poster

     Be like dad, keep mum.

• keep shtum
• stay mum

• bite one's tongue
• breathe a word
• mum's the word