mum adjective - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of mum adjective from the Oxford Advanced American Dictionary

mum

adjective

NAmE//mʌm//

saying nothing; silent

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Idioms

keep mum (informal)

to say nothing about something; to stay quiet He kept mum about what he'd seen.

mum's the word! (informal)

used to tell someone to say nothing about something and keep it secret

See mum in the Oxford Advanced Learner's Dictionary

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