To unfasten or undo the buttons on something like clothing.
From 'dis-' (to reverse) plus 'button,' the fastener. This is a straightforward formation parallel to 'unbutton,' showing how English speakers could use either prefix to indicate reversal.
While 'disbutton' and 'unbutton' mean the same thing, 'unbutton' won the popularity contest—this reminds us that language evolution isn't always logical, sometimes one word just catches on while its twin disappears.
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