American English

Definition of mouthpiece noun from the Oxford Advanced American Dictionary

     

    mouthpiece

     noun
    noun
    NAmE//ˈmaʊθpis//
     
     
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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.
  2. 2the part of a musical instrument that you place between your lips
  3. 3 (usually disapproving) mouthpiece (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.
See the Oxford Advanced Learner's Dictionary entry: mouthpiece