definition of
pump

[1] #1 pump n. a mechanical device that moves fluid or gas by pressure or suction. wn

[2] #2 pump v. operate like a pump; move up and down, like a handle or a pedal; "pump the gas pedal". wn

[3] #3 pump v. deliver forth; "pump bullets into the dummy". wn

[4] #4 pump v. draw or pour with a pump. wn

[5] #5 pump n. [heart, 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". wn