A pump that moves air either into or out of something.

A small hand-operated pump with a stirrup-shaped base that was placed in a bucket of water, allowing a small hose to direct a stream onto minor fires.

(transitive) To inflate by means of a pump. / (transitive) To inflate with a pumping action. / (transitive, figuratively) To excite a person or group to a frenzy.

(Canada, US) A device at a gas station that dispenses gasoline.

(Australia, New Zealand) Under pressure to perform, e.g. at work or in a sports contest. / Used other than figuratively or idiomatically: see under, pump.

a pump used for the removal of liquid from a sump or sump pit

(informal) Excited, particularly due to anticipation. / (bodybuilding, not comparable) Having muscles in an engorged state following exercise due to increased blood flow.

simple past tense and past participle of pump up

(of a tyre etc) inflated / (by extension) oversized / (of water) raised by pumping / (of a person) tense with excitement or enthusiasm

A water pump consisting of a series of buckets on a chain, wheel or drum.