Definition of "plunger"

A device that is used to remove blockages from the drain of a basin or tub, by suction.  examples

The internal piece of a syringe that pushes out or pulls in any contents.  examples

The sliding activator of an exploder, an electrical generator used to trigger electrical detonators such as blasting caps.  examples

Certain equipment for brewing coffee.

1. The part of a cafetière that is pushed down to remove grounds from coffee.  examples

2. A cafetière, through abbreviation of coffee plunger.  examples

One who plunges; a diver.  examples

A horse that plunges, or throws itself suddenly forward.  examples

(military) A cavalryman.

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.  examples

The moving portion of a solenoid.  examples

(pinball) The spring-loaded assembly that propels the ball onto the table.  examples

(dated, slang) A reckless gambler or gamble.  quotations

(pottery) A boiler in which clay is beaten by a wheel to a creamy consistency.  quotations  examples

(firearms) The firing pin of a breechloader.  examples