pump1

noun

• a mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable objects such as tires:a gas pump
• [in singular] an instance of moving something by or as if by a pump:the pump of blood to her heart
• [with modifier] Physiology an active transport mechanism in living cells by which specific ions are moved through the cell membrane against a concentration gradient:the bacterium’s sodium pump
• a pump-action shotgun.

verb

• 1 [with object] force (liquid, gas, etc.) to move in a specified direction by or as if by means of a pump:the blood is pumped around the body [no object]:if we pump long enough, we should bring the level up
• [no object] move in spurts as though driven by a pump:blood was pumping from a wound in his shoulder
• informal try to elicit information from (someone) by persistent questioning:she began to pump her friend for details

• 2fill (something such as a tire or balloon) with liquid or gas using a pump:I fetched the bike and pumped up the back tire my veins had been pumped full of glucose
• shoot (bullets) into a target.

• 3move vigorously up and down: [with object]:we had to pump the handle like mad [no object]:that’s superb running—look at his legs pumping
• apply and release (a brake pedal or lever) several times in quick succession, typically to prevent skidding.
• Baseball move one’s arm as if throwing a ball held in the hand, but without releasing the ball: [in combination]:behind the plate Howard double-pumped, then threw to second