button up

/B AH1 T AH0 N AH1 P/

verb

1
To remain silent, especially in order to keep a secret or to avoid saying something inappropriate.

Synonyms

verb

1
To fasten with a button or buttons.
“Button up your shirt cuff. It has come undone”
2
To fasten all the buttons on a coat, or similar item of clothing, to keep warm.
“Button up well. It's freezing outside today.”
3
To conclude; to finalize; to put the finishing touches (on)
“It's time to button up the meeting.”
4
To seal off (a military vehicle or facility).

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