Longman Dictionary of Contemporary English homepage

Sense: 1
Date: 1800-1900
Origin: MUMMY 1.
Sense: 2
Date: 1700-1800
Origin: MUM2

mum

1 noun
     
mum1 S1 W2 [countable]
1 British English mother [= mom American English]
2

mum's the word

spoken used to tell someone that they must not tell other people about a secret
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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