thrash (Verb) — Give a thrashing to; beat hard.
thrash (Verb) — Move or stir about violently. ex. "The feverish patient thrashed around in his bed"
thrash (Verb) — Dance the slam dance.
thrash (Verb) — Beat so fast that (the heart's) output starts dropping until (it) does not manage to pump out blood at all.
thrash (Verb) — Move data into and out of core rather than performing useful computation. ex. "The system is thrashing again!"
thrash (Verb) — (farming) beat the seeds out of a grain.
thrash (Verb) — Beat thoroughly and conclusively in a competition or fight. ex. "We thrashed the other team on Sunday!"
thrash (Noun) — A swimming kick used while treading water.