plunger

noun15

1. •
   A device that is used to remove blockages from the drain of a basin or tub, by suction.
2. •
   The internal piece of a syringe that pushes out or pulls in any contents.
3. •
   The sliding activator of an exploder, an electrical generator used to trigger electrical detonators such as blasting caps.
4. •
   The part of a cafetière that is pushed down to remove grounds from coffee.
5. •
   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.
6. •
   The moving portion of a solenoid.
7. •
   The spring-loaded assembly that propels the ball onto the table.
8. •
   Certain equipment for brewing coffee.
9. •
   A cafetière, through abbreviation of coffee plunger.
10. •
    One who plunges; a diver.
11. •
    A horse that plunges, or throws itself suddenly forward.
12. •
    (slang, old-fashioned) A reckless gambler or gamble.

    • Well I suppose there's not one of you gentlemen here who hasnt^([sic]) at some time or other taken a plunger, and how many of you hasnt^([sic]) come back sadder and wiser. — 1925
13. •
    The firing pin of a breechloader.
14. •
    A boiler in which clay is beaten by a wheel to a creamy consistency.

    • Another part of the invention relates to making articles of earthenware by a plunger, which is forced into a mould — 1862
15. •
    A cavalryman.