Dictionary definition · thrash
noun
- a swimming kick used while treading water
verb
- give a thrashing to; beat hard
- move or stir about violently"The feverish patient thrashed around in his bed"
- 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!"
- beat the seeds out of a grain
- beat thoroughly and conclusively in a competition or fight"We licked the other team on Sunday!"
Source: Open English WordNet (CC BY 4.0).