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button up

B1 neutral separable both
In simple words

To close your shirt or jacket by doing up the buttons; or to tell someone to be quiet.

Literal meaning: To fasten (up) the buttons on a garment.

Meanings

1 B1 neutral

To fasten all the buttons on a piece of clothing.

"It's cold outside — make sure you button up your coat before you leave."

Grammar: separable
2 B2 idiomatic informal

(Informal) To stop talking, or to refuse to speak about something.

"He buttoned up completely when the police started asking questions about that night."

3 B2 idiomatic formal

To complete or finalise something, ensuring all details are in order.

"Let's button up the contract details this afternoon so we can sign first thing tomorrow."

Grammar: separable
Usage notes

The literal sense (fastening buttons) is common and neutral. The figurative sense of going quiet or keeping information secret is informal. 'Button it' is a ruder variant of telling someone to be quiet. The figurative sense is less common than 'clam up' or 'zip it'.

Commonly used with

shirt coat jacket collar lips secret

Forms

Base
button up
I/you/we/they
3rd person
buttons up
he/she/it
Past simple
buttoned up
yesterday
Past participle
buttoned up
have + pp
-ing form
buttoning up
continuous

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Synonyms

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