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One of the series of posters using the expression "keep mum"

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  • (file)

Verb edit

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.

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