plumber's friend

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plunger

[pluhn-jer]
noun
1.
Machinery. a pistonlike reciprocating part moving within the cylinder of a pump or hydraulic device.
2.
Automotive. a pistonlike part in the valve of a pneumatic tire.
3.
Also called force cup, plumber's friend, plumber's helper. a device consisting of a handle with a rubber suction cup at one end, used as a force pump to free clogged drains and toilet traps.
4.
a person or thing that plunges.
5.
a reckless bettor or speculator.

Origin:
1605–15; plunge + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plunger (ˈplʌndʒə)
 
n
1.  a rubber suction cup fixed to the end of a rod, used to clear blocked drains
2.  a device or part of a machine that has a plunging or thrusting motion; piston
3.  informal a reckless gambler

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