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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Nor, once the crisis struck, was he the only central banker to prove handy with
  monetary plunger and wrench.
First, a plunger is pulled and rotated to release the drive and allow it to
  slide out of the server's case.
So get the old rubber plunger to clear the blockage.
He even resorts to a toilet plunger on his mouth to clean him self up.
Images for plunger
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