beat up on

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beat up

1. verb To physically attack someone, as with punches and other blows, such that they suffer significant injury. In this usage, a noun or pronoun can be used between "beat" and "up." The captain of the football team swore he would beat me up if I ever talked to his girlfriend again. I can't believe that skinny kid beat up the school bully!
2. verb To defeat an opponent easily and/or by a wide margin. In this usage, the phrase is often followed by "on." The final score was 17-1? Wow, we really beat up on that team! I got beat up by a much more highly ranked opponent in the first round.
3. verb To criticize someone harshly and/or continually. In this usage, the phrase is often followed by "on." Mom, I know you're disappointed in Stephanie's grades, but quit beating up on her—she feels bad enough as it is. I haven't made many sales this year, so I expect to get beat up in my performance review.
4. verb To damage or wear out from heavy use. I'm afraid I tend to beat up my shoes really quickly.
5. adjective Showing signs of wear or damage, as from heavy use. The phrase is typically hyphenated before a noun. Can we throw away these beat-up old notebooks already? The old car looks really beat up, but it runs pretty well.
See also: beat, up

beat up on someone

to batter someone, usually physically. Lefty beat up on Max and made a mess of him. Don't beat up on me, you bully!
See also: beat, on, up

beat up on

1. To attack physically.
2. To criticize or scold harshly.
See also: beat, on, up