ko punch(n = noun.act) haymaker, knockout punch, sunday punch - a hard punch that renders the opponent unable to continue boxing;
is a kind of biff, clout, lick, poke, punch, slug

center punch, centre punch, fish house punch, fruit punch, knockout punch, ko, ling ko, milk punch, planter's punch, punch, punch bag, punch bowl, punch card, punch in, punch line, punch out, punch pliers, punch press, rabbit punch, sucker punch, sunday punch