definition of
thrash

[1] #1 thrash v. [thresh, lam, flail] give a thrashing to; beat hard. wn

[2] #2 thrash v. [convulse, thresh, thresh about, thrash about, slash, toss, jactitate] move or stir about violently; "The feverish patient thrashed around in his bed". wn

[3] #3 thrash n. a swimming kick used while treading water. wn

[4] #4 thrash v. [slam dance, slam, mosh] dance the slam dance. wn

[5] #5 thrash v. beat so fast that (the heart's) output starts dropping until (it) does not manage to pump out blood at all. wn