- An instance of moving something or being moved by or as if by such a machine
- a mechanical device that moves fluid or gas by pressure or suction
- operate like a pump; move up and down, like a handle or a pedal; "pump the gas pedal"
- An active transport mechanism in living cells by which specific ions are moved through the cell membrane against a concentration gradient
- A mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable objects such as tires
- deliver forth; "pump bullets into the dummy"