"plunger" in the noun sense
1. speculator, plunger
someone who risks losses for the possibility of considerable gains
2. diver, plunger
someone who dives (into water)
3. plunger, plumber's helper
hand tool consisting of a stick with a rubber suction cup at one end used to clean clogged drains
4. piston, plunger
mechanical device that has a plunging or thrusting motion
Source: WordNet® (An amazing lexical database of English)
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