Definition of pump:
(n) :
a device for moving or compressing a liquid or gas; an instance of the action of a pump; one stroke of a pump; any action similar to pumping
"this pump can deliver 100 gallons of water per minute."
(v) :
to use a pump to move (liquid or gas); (often followed by up) To fill with air
"I've pumped over 1000 gallons of water in the last ten minutes."