1. (noun)pump a mechanical device that moves fluid or gas by pressure or suction
2. (noun)heart, pump, ticker the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body "he stood still, his heart thumping wildly"
3. (noun)pump a low-cut shoe without fastenings
4. (verb)pump operate like a pump; move up and down, like a handle or a pedal "pump the gas pedal"
5. (verb)pump deliver forth "pump bullets into the dummy"
6. (verb)pump draw or pour with a pump
7. (verb)pump supply in great quantities "Pump money into a project"
8. (verb)pump flow intermittently
9. (verb)pump move up and down "The athlete pumps weights in the gym"
10. (verb)pump raise (gases or fluids) with a pump
11. (verb)pump question persistently "She pumped the witnesses for information"