verb (used with object)
to separate the grain or seeds from (a cereal plant or the like) by some mechanical means, as by beating with a flail or by the action of a threshing machine.
to beat as if with a flail.
verb (used without object)
to thresh wheat, grain, etc.
to deliver blows as if with a flail.
the act of threshing.
Verb phrases
thresh out/over. thrash ( def 12 ).
Also, thrash.

before 900; Middle English threschen, thresshen, Old English threscan; cognate with German dreschen, Gothic thriskan; akin to Dutch dorsen, Old Norse thriskja

rethresh, verb (used with object)
unthreshed, adjective

thrash, thresh. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thresh (θrɛʃ)
vb (often foll by about)
1.  to beat or rub stalks of ripe corn or a similar crop either with a hand implement or a machine to separate the grain from the husks and straw
2.  (tr) to beat or strike
3.  to toss and turn; thrash
4.  the act of threshing
[Old English threscan; related to Gothic thriskan, Old Norse thriskja; see thrash]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. þrescan, þerscan "to beat, sift grain by trampling or beating," from P.Gmc. *threskanan "to thresh," originally "to tread, to stamp noisily" (cf. M.Du. derschen, Du. dorschen, O.H.G. dreskan, Ger. dreschen, O.N. þreskja, Goth. þriskan), from PIE base *tere- "to rub, turn"
(see throw). The basic notion is of treading out wheat under foot of men or oxen, later, with the advent of the flail, the word acquired its modern extended sense of "to knock, beat, strike." The original Gmc. sense is suggested by the use of the word in Romanic languages that borrowed it, e.g. It. trescare "to prance," O.Fr. treschier "to dance," Sp. triscar "to stamp the feet." The thresher shark (1609) so called for its long upper tail shape.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
After the grain had ripened sufficiently in the shocks, it was ready to be
  threshed so that the farmer could sell it.
Wheat is threshed in an antique machine several times a day.
Grains are first cut, without being threshed, and left to dry in windrows for
  several days or longer.
Three heads were selected, at random, from each row and individually manually
  threshed and stored in labelled envelopes.
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