button [buttoned, buttoning, buttons](to fasten with a button) verb [UK: ˈbʌt.n̩] [US: ˈbʌt.n̩]
button up(to fasten with a button or buttons) verb [UK: ˈbʌt.n̩ ʌp] [US: ˈbʌt.n̩ ʌp]
desabotonarverb
unbutton [unbuttoned, unbuttoning, unbuttons]((transitive)) verb [UK: ʌn.ˈbʌt.n̩] [US: ʌn.ˈbət.n̩]John started to unbutton his shirt. = John comenzó a desabotonar su camisa.