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pump 1 (pŭmp)
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n.
1. A machine or device for raising, compressing, or transferring fluids.
2. Physiology A molecular mechanism for the active transport of ions or molecules across a cell membrane.
3. Physics Electromagnetic radiation used to raise atoms or molecules to a higher energy level.
4. Informal The heart.
5. Informal The place where consumers purchase gasoline. Used with the:gas prices rising at the pump.
v.pumped, pump·ing, pumps
v.tr.
1. To cause to flow by means of a pump or pumplike organ or device:Derricks pumped oil out of the ground. The heart pumps blood throughout the body.
2. To draw, deliver, or pour forth:a writer who pumped out a new novel every year.
3. To propel, eject, or insert:pumped new life into the economy.
4. To cause to move with an up-and-down or back-and-forth motion:a bicyclist pumping the pedals; a piston pumping a shaft.
5. To push or pull (a brake or lever, for instance) rapidly:a driver pumping the brakes.
6. To shoot (bullets, for example) at or into:a gunner pumping rounds at a target.
7. Physics To raise (atoms or molecules) to a higher energy level by exposing them to electromagnetic radiation at a resonant frequency.
8. Physiology To transport (ions or molecules) against a concentration gradient by the expenditure of chemically stored energy.
9. To invest (money) repeatedly or persistently in something.
10. To question closely or persistently:pump a witness for secret information.
11. Informal To promote or publicize vigorously:The company pumped its new product on its website.
v.intr.
1. To operate a pump.
2. To move gas or liquid with a pump or a pumplike organ or device.
3. To move up and down or back and forth in a vigorous manner:My legs were pumping as I ran up the stairs.
4. To flow in spurts:Blood was pumping from the wound.
5. Sports To fake a throw, pass, or shot by moving the arm or arms without releasing the ball.
Phrasal Verb:
pump up
1. To inflate with gas by means of a pump:pump up a tire.
2. Slang To fill with enthusiasm, strength, or energy:The lively debate really pumped us up.
3. Sports To be actively involved in a bodybuilding program:athletes pumping up at the gym.
Idiom:
pump ironSports
To lift weights.

[Middle Englishpumpe.]

pumpern.
(click for a larger image)
pump1
top: jet pump
bottom: centrifugal pump

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
pump 2 (pŭmp)
Share:
n.
A shoe that has a closed back and is cut low around the toes, usually with heels and no fastenings.

[Origin unknown.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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