Same word as knock-down-drag-out:

affray, altercation, battle, battle royal, bickering, brawl, broil, brouhaha, dispute, donnybrook, feud, flap, fray, free-for-all, hassle, knock-down-drag-out, melee, mix up, quarrel, riot, row, ruction, ruffle, rumpus, run-in, scrimmage, scuffle, set-to, squabble, st