unbutton
US /ʌnˈbʌt̬.ən/
UK /ʌnˈbʌt̬.ən/

1.
membuka butang, melepaskan butang
to unfasten the buttons of something
:
•
Please unbutton your coat before you sit down.
Sila buka butang kot anda sebelum duduk.
•
She watched him slowly unbutton his shirt.
Dia melihatnya perlahan-lahan membuka butang bajunya.