The noun pump has 3 senses (first 1 from tagged texts)
1. (4) pump -- (a mechanical device that moves fluid or gas by pressure or suction)
2. 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. pump -- (a low-cut shoe without fastenings)
Overview of verb pump
The verb pump has 8 senses (first 3 from tagged texts)
1. (4) pump -- (operate like a pump; move up and down, like a handle or a pedal; "pump the gas pedal")
2. (3) pump -- (deliver forth; "pump bullets into the dummy")
3. (1) pump -- (draw or pour with a pump)
4. pump -- (supply in great quantities; "Pump money into a project")
5. pump -- (flow intermittently)
6. pump -- (move up and down; "The athlete pumps weights in the gym")
7. pump -- (raise (gases or fluids) with a pump)
8. pump -- (question persistently; "She pumped the witnesses for information")