Definitions from Wiktionary ( )

▸ noun:  A device that is used to remove blockages from the drain of a basin or tub, by suction.
▸ noun:  The internal piece of a syringe that pushes out or pulls in any contents.
▸ noun:  The sliding activator of an exploder, an electrical generator used to trigger electrical detonators such as blasting caps.
▸ noun:  Certain equipment for brewing coffee.
▸ noun:  The part of a cafetière that is pushed down to remove grounds from coffee.
▸ noun:  A cafetière, through abbreviation of coffee plunger.
▸ noun:  One who plunges; a diver.
▸ noun:  A horse that plunges, or throws itself suddenly forward.
▸ noun:  (military) A cavalryman.
▸ noun:  A device similar to a piston but without a mechanism; a long solid cylinder used, instead of a piston or bucket, as a forcer in pumps.
▸ noun:  The moving portion of a solenoid.
▸ noun:  (pinball) The spring-loaded assembly that propels the ball onto the table.
▸ noun:  (dated, slang) A reckless gambler or gamble.
▸ noun:  (pottery) A boiler in which clay is beaten by a wheel to a creamy consistency.
▸ noun:  (firearms) The firing pin of a breechloader.

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