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English definition of “mum”

mum

noun [C] uk   /mʌm/ UK informal (US mom) us  
A1 a mother: [as form of address] Happy birthday, Mum. All the mums and dads are invited to the school play at the end of the year. She loves being a mum.

mum

adjective uk   /mʌm/ informal us  
keep mum to say nothing about a subject: It's not official yet, so keep mum.
(Definition of mum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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