plunger : Idioms & Phrases
Plunger bucket
- a piston, without a valve, in a pump.
Webster 1913
Plunger pole
- the pump rod of a pumping engine.
Webster 1913
Plunger pump
- a pump, as for water, having a plunger, instead of a piston, to act upon the water. It may be single-acting or double-acting