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thrash has 17 distinct synonyms spread across 5 of its 8 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
move or stir about violently
“The feverish patient thrashed around in his bed”
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!”
a swimming kick used while treading water
Synonyms, antonyms and the broader and narrower relations for thrash come from Princeton University’s WordNet. Full sources and licences.