mum
adjective/mʌm/
/mʌm/
Word Originadjective late Middle English: imitative of a sound made with closed lips.
Idioms Idioms
See mum in the Oxford Advanced American Dictionarykeep mum
- (informal) to say nothing about something; to stay quiet
- He kept mum about what he'd seen.
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mum’s the word!
- (informal) used to tell somebody to say nothing about something and keep it secret
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mum