thresh vs beat up

thresh and beat up both are verbs.

Word	Noun	Adjective	Verb	Adverb
thresh	No	No	Yes	No
beat up	No	No	Yes	No

As verbs, beat up is a hypernym of thresh; that is, beat up is a word with a broader meaning than thresh:

thresh: give a thrashing to; beat hard
beat up: give a beating to; subject to a beating, either as a punishment or as an act of aggression

Other hypernyms of thresh include beat, work over.

thresh (verb)	beat up (verb)
give a thrashing to; beat hard	gather
beat the seeds out of a grain	give a beating to; subject to a beating, either as a punishment or as an act of aggression
move or stir about violently
move like a flail; thresh about