Noun

1. A mechanical device that moves fluid or gas by pressure or suction
2. The hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body
3. A low-cut shoe without fastenings

Verb

1. Operate like a pump; move up and down, like a handle or a pedal
2. Deliver forth
3. Draw or pour with a pump
4. Supply in great quantities
5. Flow intermittently
6. Move up and down
7. Raise (gases or fluids) with a pump
8. Question persistently