To force a liquid or gas to move in a particular direction using a pump. They pumped water from the flooded basement.
To move up and down or in and out with a regular rhythm. The heart pumps blood throughout the body.
To inflate something by using a pump. He pumped the bicycle tires before the race.
To supply or inject something in large quantities. The company pumped millions of dollars into the new project.
To question someone persistently to obtain information. The detective pumped the suspect for details about the crime.