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1. To strike and damage something. A noun can be used between "bang" and "up." That accident banged up the passenger side door of my car. Be careful with my phone—don't bang the screen up!
2. To hurt someone by striking or otherwise impacting them. I got really banged up in that car accident.
Hurt. Damaged (often from use or wear). A: "So you only have a few bruises? That's wonderful!" B: "I know, I'm so lucky to be only a little banged up from the car accident." Oh, the really banged-up copy of To Kill a Mockingbird, the one that looks like it's about to fall apart? It's mine.