KO, blast, blot out, bump off, call off, cancel, complete, croak, delete, dispose of, do in, drop the curtain, end off, erase, expunge, extinguish, finalize, finish, fix, fold up, get, get it over, get over with, get through with, give the business, give the quietus, gun down, hit, ice, kayo, kibosh, kill, knock out, lay out, off, perfect, polish off, put paid to, rub out, scrag, settle, shoot down, take care of, waste, wipe out