Definitions from Wiktionary ( )

▸ verb:  (transitive, agriculture) To separate the grain from the straw or husks (chaff) by mechanical beating, with a flail or machinery, or by driving animals over them.
▸ verb:  (transitive, literary) To beat soundly, usually with some tool such as a stick or whip; to drub.
▸ verb:  (intransitive, literary) To violently toss the limbs about.

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