Nouns

(n)thrasha swimming kick used while treading water

Verbs

(v)thrash, thresh, lam, flailgive a thrashing to; beat hard
(v)convulse, thresh, thresh about, thrash, thrash about, slash, toss, jactitatemove or stir about violently“The feverish patient thrashed around in his bed”
(v)slam dance, slam, mosh, thrashdance the slam dance
(v)thrashbeat so fast that (the heart's) output starts dropping until (it) does not manage to pump out blood at all
(v)thrashmove data into and out of core rather than performing useful computation“The system is thrashing again!”
(v)thrash, threshbeat the seeds out of a grain
(v)cream, bat, clobber, drub, thrash, lickbeat thoroughly and conclusively in a competition or fight“We licked the other team on Sunday!”