IPA: /ʌnˈbʌtən/
KK: /ʌnˈbʌtən/
To open or release buttons on clothing.
She decided to unbutton her coat as she entered the warm room.
Past: unbuttoned
Past Participle: unbuttoned
To take off or open the buttons of something, like a shirt or jacket.
She decided to unbutton her coat as she entered the warm room.
Past: unbuttoned
Past Participle: unbuttoned
Unbutton → It is formed from "un-" (meaning not or opposite of) and "button" (from Old French *bouton*, meaning a small knob or fastener). The word "unbutton" means to remove or undo a button, effectively reversing the action of fastening something with a button.
Think of 'un-' meaning to reverse or remove, and 'button' as the fastener you are taking off. This helps you remember that 'unbutton' means to take off a button.