thresh

(verb) move or stir about violently. Synonyms: convulse, thresh about, thrash, thrash about, slash, toss, jactitate. Example: "The feverish patient thrashed around in his bed."

(verb) move like a flail; thresh about. Synonyms: flail. Example: "Her arms were flailing."

(verb) beat the seeds out of a grain. Synonyms: thrash.

(verb) give a thrashing to; beat hard. Synonyms: thrash, lam, flail.