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to keep mum
01
to refuse to speak, especially about a secret or sensitive topic
Grammatical Information
Composition
phrasal
Action verb
Regular
Inseparable
Particle
mum
Base verb
keep
Present tense
keep mum
3rd person singular
keeps mum
Present participle
keeping mum
Past simple
kept mum
Past participle
kept mum
Examples
They keep mum when asked about the project.
