Webster's English Dictionary

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thresh

thresh \'thrash, 'thresh\ vb [ME thresshen, fr. OE threscan; akin to OHG 
   dreskan to thresh], L terere to rub - more at THROW 1: to separate seed 
   from (a harvested plant) mechanically; also :  to separate (seed) in this 
   way 2a: to go over again and again {~ the matter over}  2b: to hammer out : 
   FORGE {~ out a plan}  3: to strike repeatedly : THRASH  1: to thresh grain  
   2: to strike with or as if with a flail or whip  3: to toss about