verb
refuse to talk or stop talking; fall silent
-
The children shut up when their father approached
• Syn:
• Verb Frames:
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Somebody ——s
* * *
to keep something secret
Thesaurus: to keep something secretsynonym
Main entry: mum
* * *
informal remain silent, esp. so as not to reveal a secret
he was keeping mum about a possible move to Canada
* * *
keep mum idiom
•
He kept mum about what he'd seen.
Useful english dictionary. 2012.