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