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mum's the word
Mum's the word.
Fig. a pledge not to reveal a secret or to tell about something or someone. "Mum's the word," said Jane to ease Mary's mind about her secret.
mum's the word
do not tell anyone I don't want to spoil the surprise for Tim, so please tell everyone that mum's the word.
Mum's the word.
(informal) something that you say which means something should be kept secret I think I'm pregnant, but mum's the word until I know for sure.
mum's the word
Say nothing about this, it's a secret, as in Mum's the word on tonight's surprise party. This expression dates from about 1700, but mum, meaning "silence," is much older. In 2 Henry VI (1:2) Shakespeare wrote, "Seal up your lips, and give no words but mum."
mum's the word
Say nothing of the secret you know: Mum's the word on the surprise party.