American English

Definition of unbutton verb from the Oxford Advanced American Dictionary

 

unbutton

 verb
verb
NAmE//ʌnˈbʌtn//
 
unbutton somethingVerb Forms present simple I / you / we / they unbutton
 
he / she / it unbuttons
 
past simple unbuttoned
 
-ing form unbuttoning
 
 
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to undo the buttons on a piece of clothing He unbuttoned his shirt. opposite button (up)
See the Oxford Advanced Learner's Dictionary entry: unbutton