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.

to thresh wheat, grain, etc.

to deliver blows as if with a flail.

the act of threshing. ?

thresh out or over. thrash ( def. 12 ) .

verb

flail , assail , assault , baste , batter , belabor , buffet , drub , hammer , pound , pummel , smash , thrash , toss

phrasal verb

bandy , moot , talk over , thrash out , toss around