KO, bugger, call off, cancel, complete, cripple, de-energize, debilitate, delete, disable, disenable, dispose of, drain, drop the curtain, end off, enfeeble, expunge, extinguish, finalize, finish, fold up, get it over, get over with, get through with, give the quietus, hamstring, hors de combat, inactivate, incapacitate, kayo, kill, knock out, lame, maim, perfect, polish off, put, put paid to, queer, queer the works, sabotage, scrag, shoot down, spike, unfit, weaken, wing, wipe out, wreck, zap