Here you will find one or more explanations in English for the word Thrash.
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Thrash
Thrash Thrash, Thresh Thresh, v. t.
1. To practice thrashing grain or the like; to perform the
business of beating grain from straw; as, a man who
thrashes well.
2. Hence, to labor; to toil; also, to move violently.
I rather would be M[ae]vius, thrash for rhymes, Like
his, the scorn and scandal of the times. --Dryden.
Meaning of Thrash from wikipedia