American English

Definition of mum adjective from the Oxford Advanced American Dictionary

 

mum

 adjective
adjective
NAmE//mʌm//
 
 
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  • saying nothing; silent
  • Idioms
    keep mum (informal)
     
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    to say nothing about something; to stay quiet He kept mum about what he'd seen.
    mum's the word! (informal)
     
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    used to tell someone to say nothing about something and keep it secret