beat up vs trounce

beat up and trounce both are verbs.

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

As verbs, trounce is a hyponym of beat up; that is, trounce is a word with a more specific, narrower meaning than beat up:

beat up: give a beating to; subject to a beating, either as a punishment or as an act of aggression
trounce: beat severely with a whip or rod

beat up (verb)	trounce (verb)
gather	censure severely or angrily
give a beating to; subject to a beating, either as a punishment or as an act of aggression	come out better in a competition, race, or conflict
	beat severely with a whip or rod