pump 1 |pəmp|
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 sing. ] an instance of moving something or being moved by or as if by such a machine : the pump of blood to her heart.
• [with adj. ] 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 [ trans. ] 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 | [ intrans. ] if we pump long enough, we should bring the level up.
• [ intrans. ] move in spurts as though driven by a pump : blood was pumping from a wound in his shoulder.
• fill with something : my veins had been pumped full of glucose.
• shoot (bullets) into a target.
• ( pump something in/into) informal invest a large amount of money in (something) : he pumped all his savings into building the boat.
• [ trans. ] informal try to elicit information from (someone) by persistent questioning : she began to pump her friend for details.
2 [ trans. ] move (something) vigorously up and down : we had to pump the handle like mad.
• [ intrans. ] move vigorously up and down or back and forth : 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.
• 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.
PHRASES pump someone's hand shake a person's hand vigorously. pump iron informal exercise with weights.
PHRASAL VERBS pump out produce or emit (something) in large quantities or amounts : that little printing press pumped out our brochures for more than twenty years. pump up inflate (a tire, balloon, etc.)
• informal increase : she needs to read and pump up her political grip.
• informal turn up the volume of (music) : let's pump up those tunes, man.
• informal give inappropriate support and encouragement to : we let them pump up our egos. ORIGIN late Middle English (originally in nautical use): related to Dutch pomp ‘ship's pump’ (earlier in the sense ‘wooden or metal conduit’ ), probably partly of imitative origin.pump 2 noun a light shoe, in particular
• a woman's plain, lightweight shoe that has a low-cut upper, no fastening, and typically a medium heel.
• a man's slip-on patent leather shoe for formal wear. ORIGIN mid 16th cent.: of unknown origin.
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