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force pump a pump with a valveless plunger, used to raise the level of a liquid or convey it through a pipe by the application of pressure.
plumber's helper (informal) a large suction cup on a handle, used to clear drains; plumber's friend; plunger.
valve in musical instruments such as the trumpet, a finger-controlled plunger that can rapidly cut off or lengthen the air column through the instrument to change the pitch sounded. [1/5 definitions]