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English definition of “mouthpiece”

mouthpiece

noun [C] uk   /ˈmaʊθ.piːs/ us  

mouthpiece noun [C] (PIECE OF EQUIPMENT)

the part of a phone, musical instrument, or other device that goes near or between the lips: To play the recorder, blow gently into the mouthpiece.Musical instruments in generalTelephone equipment

mouthpiece noun [C] (PERSON/NEWSPAPER)

disapproving a person or a newspaper that only expresses the opinions of one particular organization: This newspaper is just a Republican mouthpiece.Newspapers and magazines
(Definition of mouthpiece from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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