I. ˈthrash verb
Etymology: alteration of thresh
Date: 1568
transitive verb
1. : to separate the seeds of from the husks and straw by beating : thresh 1
2.
a. : to beat soundly with or as if with a stick or whip : flog
b. : to defeat decisively or severely
thrash ed the visiting team
3. : to swing, beat, or strike in the manner of a rapidly moving flail
thrash ing his arms
4.
a. : to go over again and again
thrash the matter over inconclusively
b. : to hammer out : forge
thrash out a plan
intransitive verb
1. : thresh 1
2. : to deal blows or strokes like one using a flail or whip
3. : to move or stir about violently : toss about
thrash in bed with a fever
Synonyms: see swing
II. noun
Date: 1840
1. : an act of thrashing
2. : rock music (as heavy metal or punk rock) that is extremely fast and loud