/ mʌm; NAmE / noun , adjective
■ noun
( BrE ) ( NAmE mom ) ( informal ) a mother :
My mum says I can't go.
Happy Birthday, Mum.
A lot of mums and dads have the same worries.
■ adjective
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IDIOMS
- keep mum
- mum's the word!
••
WORD ORIGIN
noun mid 17th cent.: abbreviation of mummy mother .
adjective late Middle English : imitative of a sound made with closed lips.