pound on

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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.
See also: on, pound

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?
See also: on, pound