A plunger is a device that is used to release stoppages in plumbing. Plunger may also refer to: French press, a simple coffee brewing device A component of a syringe Plunger (pinball), a spring-loaded rod used to launch balls in pinball USS Plunger, several United States naval vessels Plunger-class submarine, an early class of United States Navy submarines Plunger lift, a natural gas well deliquification techniques Plunger mute, the rubber part of a plumbing plunger, or a similar device, used as a musical mute The Plungers, an obsolete nickname for the Household Cavalry See also Plunge (disambiguation)