"thrash" in the noun sense
a swimming kick used while treading water
"thrash" in the verb sense
1. thrash, thresh, lam, flail
give a thrashing to beat hard
2. convulse, thresh, thresh about, thrash, thrash about, slash, toss, jactitate
move or stir about violently
"The feverish patient thrashed around in his bed"
3. slam dance, slam, mosh, thrash
dance the slam dance
beat so fast that (the heart's) output starts dropping until (it) does not manage to pump out blood at all
move data into and out of core rather than performing useful computation
"The system is thrashing again!"
6. thrash, thresh
beat the seeds out of a grain
7. cream, bat, clobber, drub, thrash, lick
beat thoroughly and conclusively in a competition or fight
"We licked the other team on Sunday!"
Source: WordNet® (An amazing lexical database of English)
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