button-up
adjectiveUK /ˈbʌtən ʌp/
US /ˈbʌtən ʌp/
A button-up shirt is a shirt that closes with small round buttons down the front.
He wore a blue button-up shirt to the party.
OTHER MEANINGS
2. To fasten something with buttons.
Please button up your coat before you go outside.
3. To finish or complete something in a careful way.
The team buttoned up the project before the deadline.
4. To become quiet and stop talking.
The kids buttoned up when the teacher walked in.