Similar word to thrash:

batter, beat up, belabor, belt, birch, buffet, bury, cane, chasten, chastise, clobber, crush, defeat, flagellate, flog, jerk, kill, lambaste, lick, maul, murder, overwhelm, paste, pelt, pitch, pound, pummel, punish, rout, rush, scourge, seesaw, slaughter, spank, stir, strike, surge, tan, tan one's hide, thresh, toss, toss and turn, trash, trim, trounce, wallop, wax, whip, work over, writhe


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