Meaning of PLUNGER in English

PLUNGER

plung ‧ er /ˈplʌndʒə $ -ər/ BrE AmE noun [countable]

1 . a tool for clearing waste that is blocking a kitchen or bathroom pipe. It consists of a straight handle with a rubber cup on the end.

2 . technical a part of a machine that moves up and down

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.