What is the meaning of threshing?

noun

• The separation of grain or seeds from the husks and straw.
  • usage: "they used to do the threshing by hand but now there are machines to do it"

verb

• Move or stir about violently.
  • usage: "The feverish patient thrashed around in his bed"
  • synonyms: convulse, thresh, thresh about, thrash, thrash about, slash, toss, jactitate
• Move like a flail; thresh about.
  • usage: "Her arms were flailing"
  • synonyms: flail, thresh
• Beat the seeds out of a grain.
  • synonyms: thrash, thresh
• Give a thrashing to; beat hard.
  • synonyms: thrash, thresh, lam, flail