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Mum's the Word

To keep secret


  • Since 1350, ‘Mum’ is used to refer ‘silent’. When we say ‘Mum’, it seems that we are trying to talk with or lips shut. This expression became popular in the 18th century.   

Please do not forget to mum’s the word about my new plan.

Submitted on February 25, 2019

Additional definitions for 'Mum's the Word':

mum's the wordThe accompanying facts are a secret, not to be divulged.
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