same as beaten up
- offer a beating to; susceptible to a beating, either as a punishment or as an act of violence
"thrash, hit over and over repeatedly," c.1900 (v.), from beat (v.). Beat-up as an adjectival expression meaning "worn-out" dates to 1946.
The whole gang would end up jumping him and he would beat up each and every one, always careful to hold back enough so as not to kill anyone.