repeal, annul, revoke, countermand, reverse, overturn, lift, recind, retract, dissolve, more...

confirm, ratify

revoke, repeal, withdraw, cancel, abrogate, annul, nullify, more...

cancel, so to speak,   issue a retraction,   to cancel,   take away again,   takes it back,   scrap a rule,   to revoke something,   i cancel,   cancel it,   to be undone