plunger

[ pluhn-jer ]
/ ˈplʌn dʒər /

noun

Machinery. a pistonlike reciprocating part moving within the cylinder of a pump or hydraulic device.
Automotive. a pistonlike part in the valve of a pneumatic tire.
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.
a person or thing that plunges.
a reckless bettor or speculator.

Origin of plunger

First recorded in 1605–15; plunge + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for plunger

British Dictionary definitions for plunger

plunger

/ (ˈplʌndʒə) /

noun

a rubber suction cup fixed to the end of a rod, used to clear blocked drains
a device or part of a machine that has a plunging or thrusting motion; piston
informal a reckless gambler
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for plunger

plunger


n.

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

Online Etymology Dictionary, © 2010 Douglas Harper