~ 1
■ noun
1》 a mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable objects.
2》 Physiology a mechanism in living cells by which specific ions are moved through a cell membrane against a concentration gradient.
■ verb
1》 force (liquid, gas, etc.) to move by or as if by means of a ~.
↘move in spurts as though driven by a ~.
↘( ~ something out ) produce or emit something in large quantities or amounts.
2》 (often ~ something up ) fill (something) with (liquid, gas, etc.).
↘( ~ something up ) informal turn up the volume of music.
↘[as adjective ~ed up ] informal very enthusiastic or excited.
3》 move or cause to move vigorously up and down.
4》 informal try to elicit information from (someone) by persistent questioning.
Phrases
~ iron informal exercise with weights.
Derivatives
~er noun
Origin
ME: related to Du. pomp 'ship's ~', prob. partly of imitative origin.
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~ 2
■ noun
1》 chiefly N. English a plimsoll.
2》 Brit. a light shoe for dancing.
3》 N. Amer. a court shoe.
Origin
C16: of unknown origin.