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mum

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1mum/ˈmʌm/adjective
1mum
/ˈmʌm/
adjective
Learner's definition of MUM  
informal
: not talking about something

mum's the word

informal
— used to say that some information is being kept secret or should be kept secret
2mum/ˈmʌm/noun
pluralmums
2mum
/ˈmʌm/
noun
pluralmums
Learner's definition of MUM  
[count]US
3mum/ˈmʌm/noun
pluralmums
3mum
/ˈmʌm/
noun
pluralmums
Learner's definition of MUM  
[count]British, informal
: mother mom
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