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to button up
01
to stop speaking or deliberately say nothing, especially to avoid revealing information
Grammatical Information
Composition
phrasal
Action verb
Regular
Separable
Particle
up
Base verb
button
Present tense
button up
3rd person singular
buttons up
Present participle
buttoning up
Past simple
buttoned up
Past participle
buttoned up
Examples
He buttoned up when the police questioned him.
