button up

Short definition from Wiktionary

Verb

1. 1
   To fasten with a button or buttons.
2. 2
   To fasten all the buttons on a coat, or similar item of clothing, to keep warm.
3. 3
   To conclude; to finalize; to put the finishing touches (on).
4. 4
   Alternative form of button up one's lip.
5. 5
   To seal off (a military vehicle or facility).

Noun

1. 1
   A shirt fastened by a vertical column of buttons at the front.