unbutton
🇺🇸
/ˌʌnˈbʌtn/
🇬🇧
/ˌʌnˈbʌtn/
To unfasten the buttons on something, like a shirt or a coat.
She unbuttoned her coat as she entered the warm room.
그녀는 따뜻한 방에 들어가면서 코트의 단추를 풀었습니다.