mum's the word

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English

Etymology

From mum (silence). Recorded since 1704.

Pronunciation

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Phrase

mum's the word

  1. (idiomatic) Indicates that something is a secret and not to be divulged.
    She doesn't know anything about it yet, so mum's the word, OK?
    • 1879, Anna Katharine Green, The Leavenworth Case: A Lawyer's Story, G. P. Putnam's Sons, page 256:
      … and that mum is the word till I give you liberty to speak

Translations

See also