Definition of plunger
: one that plunges: such as
a : diver
b : a reckless gambler or speculator
c(1) : a sliding reciprocating piece driven by or against fluid pressure especially : piston
(2) : a piece with a motion 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
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