PLUNGER

[plung.er] n (1611): one that plunges: as a: diver b: a reckless gambler or speculator c (1): a sliding reciprocating piece driven by or against fluid pressure; esp: piston (2): a piece with a motion more or less like that of a ram or piston d: a rubber suction cup on a handle used to free plumbing traps and waste outlets of obstructions