Synonyms for Thrash (same or very similar meaning)
WordNet sense 1 (dance the slam dance):
mosh, slam, slam danceWordNet sense 2 (move or stir about violently):
convulse, slash, thresh, toss, jactitate, thrash about, thresh aboutWordNet sense 3 (give a thrashing to; beat hard):
flail, lamWordNet sense 4 (beat thoroughly and conclusively in a competition or fight):
bat, clobber, cream, drub, lickFrom the ODE community, based on WordNetadd/edit