UNBUTTON


Meaning of UNBUTTON in English

un ‧ but ‧ ton /ʌnˈbʌtn/ BrE AmE verb [transitive]

to undo the buttons on a piece of clothing OPP button up :

He took off his sweater and unbuttoned his shirt.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.