a mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable objects such as tyres

a petrol pump

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

the shotgun was a 12-gauge pump

force (liquid, gas, etc.) to move by or as if by means of a pump

the blood is pumped around the body

fill (something such as a tyre or balloon) with liquid or gas using a pump

I pumped the tyres and oiled the chain

my veins had been pumped full of glucose

move vigorously up and down

we had to pump the handle like mad

that's superb running—look at his legs pumping

try to elicit information from (someone) by persistent questioning

she began to pump her friend for details

I pumped him about his political activities

a sports shoe; a plimsoll

a court shoe