pump verb definition in How machines work topic from the Oxford Advanced Learner's Dictionary

pump

 verb: How machines work topic
[transitive, intransitive] to make water, air, gas, etc. flow in a particular direction by using a pump or something that works like a pump pump (something) (+ adv./prep.) The engine is used for pumping water out of the mine. The heart pumps blood around the body. pump something + adj. The lake had been pumped dry.

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