From Longman Dictionary of Contemporary Englishplungerplung‧er /ˈplʌndʒə $ -ər/ noun [countable] 1 
DHTZa 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 TE technical a part of a machine that moves up and down
DHTZa 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 TE technical a part of a machine that moves up and downExamples from the Corpus
plunger• How can a sink plunger be so horrific?• His left index finger pressed firmly on the telephone plunger as if he were extinguishing a burning cigarette. 