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plunger (n.)

1610s, "one who plunges," agent noun from plunge (v.). As a mechanism, 1777.

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Definitions of plunger from WordNet

plunger (n.)
someone who risks losses for the possibility of considerable gains;
Synonyms: speculator
plunger (n.)
someone who dives (into water);
Synonyms: diver
plunger (n.)
hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains;
Synonyms: plumber's helper
plunger (n.)
mechanical device that has a plunging or thrusting motion;
Synonyms: piston
From wordnet.princeton.edu