名詞 plunger:

1. someone who risks losses for the possibility of considerable gains
   同義詞：speculator
2. someone who dives (into water)
   同義詞：diver
3. hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains
   同義詞：plumber's helper
4. mechanical device that has a plunging or thrusting motion
   同義詞：piston

plung.er

n.（名詞）
One who plunges or dives.
跳水者，潛水者
A device consisting of a rubber suction cup attached to the end of a stick, used to clean out clogged drains and pipes.Also called plumber`s helper
手壓皮碗泵：由固定在一根棍子末端的橡皮抽吸杯構(gòu)成的一種裝置，用來疏通堵塞的下水道或管道也作 plumber`s helper
A machine part, such as a piston, that operates with a thrusting or plunging movement.
撞針桿：一種帶有猛烈的沖或扎運動來運作的機器部件，如撞針