Akademik

undo
verb /ʌnˈduː/
a) To reverse the effects of an action.

Fortunately, we can undo most of the damage to the system.

b) To unfasten.

Could you undo my buckle for me?

Syn: cancel, reverse, unbuckle, unbutton, untie, unzip
Ant: do up, button, button up, tie up, zip, zip up

Wikipedia foundation.