The definition of a pump is a device that forces gas or liquid into something, or pulls gas or liquid out of something.(noun)
See pump in Webster's New World College Dictionary
Origin: ME pumpe < MDu pompe < Sp bomba, prob. of echoic orig.
Origin: < ? prob. < Fr colloq. pompe, boot, shoe, lit. pump: jocular for a shoe which pumps in the water
See pump in American Heritage Dictionary 4
Origin: Middle English pumpe.
top: jet pump
bottom: centrifugal pump
Origin: Origin unknown.
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