Pronunciation: (thresh),[key] —v.t. 1. 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.
2. to beat as if with a flail.
—v.i. 1. to thresh wheat, grain, etc.
2. to deliver blows as if with a flail.
3. thresh out or over.See thrash (def. 8).