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1. To strike or hammer someone or something repeatedly and with great force. A noun or pronoun can be used between "pound" and "on" to specify something that's being used to strike the person or thing. Quit pounding on that door, I heard you the first time! He pounded on the poor guy over and over. I pounded my boot on the side of the car to get the sand out of it.
2. To beat someone up. The bullies have been pounding on me after school almost every day for the last two weeks.
3. To outperform someone resoundingly in some competitive activity. The reigning champions have been pounding on this underdog team for the entire first half of the game. Unless something drastic changes, I'd say this game is all but decided already.
pound something on someone or something
to hit or strike someone or something with something. Sarah pounded the vase on the robber until it broke. Betty stood pounding her shoe on the radiator, hoping the racket would magically bring heat.
pound on someone or something
to beat or hammer on someone or something. She kept pounding on him until he released her. Will you please stop pounding on that drum?