blow, bobble, boggle, bollix (up), boot, botch, bugger (up), bumble, bungle, butcher, dub, flub, fluff, foozle, foul up, fumble, goof (up), louse up, mangle, mess (up), muff, murder, screw up

blunder, gum (up), muddle, piffleblemish, blight, damage, flaw, harm, hurt, impair, injure, mar, mutilate, ruin, spoil, vitiatedestroy, wreckmishandle, mismanage

ameliorate, better, enhance, help, improve, meliorate, rectify, refine, reform, remedydoctor, fix, patch, recondition, renovate, repair, revamp