thresh

verb6

1. •
   To separate the grain from the straw or husks (chaff) by mechanical beating, with a flail or machinery, or by driving animals over them.
2. •
   To be so separated, or to be capable of being so separated.
3. •
   (literary) To violently toss the limbs about.

   • The jay fell all lopsidedly and threshing, as though it were having a fit. The ground killed it. — 1967
4. •
   (literary) To beat soundly, usually with some tool such as a stick or whip; to drub.
5. •
   (literary) To belabor; to go over repeatedly, especially an argument.
6. •
   To drive through adverse conditions (wind, waves).