Definition of mouthpiece noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈmaʊθpiːs//
    ; NAmE NAmE//ˈmaʊθpiːs//
    Communication devices, The press, Musical instruments
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  1. 1the part of the telephone that is next to your mouth when you speak He put his hand over the mouthpiece and called his wife to the phone. See related entries: Communication devices
  2. 2the part of a musical instrument that you place between your lips See related entries: Musical instruments
  3. 3mouthpiece (of/for somebody) a person, newspaper, etc. that speaks on behalf of another person or group of people The newspaper has become the official mouthpiece of the opposition party. The Press Secretary serves as the President's mouthpiece. The media is controlled by the state and acts as a mouthpiece for the ruling party. See related entries: The press
See the Oxford Advanced American Dictionary entry: mouthpiece