thrash in WordNet English dictionary

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

1. a swimming kick used while treading water
   thrash