What is Pump ?
Pump is (noun) a machine for forcing liquids or air (verb) 1. to force in something such as liquid or air with a pump Your back tyre needs pumping up. The heart pumps blood round the body. 2. to ask someone a lot of questions to try to get information (informal.) We pumped her after the interview to find out the sort of questions she had been asked.
source: Easier English, Student Dictionary Upper Intermediate Level