mouthpiece

mouth +‎ piece

• IPA^(key): /ˈmaʊθˌpiːs/

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mouthpiece (plural mouthpieces)

1. A part of any device that functions in or near the mouth, especially:
   1. The part of a telephone that is held close to the mouth.
   2. The part of a wind instrument that is held in or against the mouth.
2. A spokesman; one who speaks on behalf of someone else.

   The novel's protagonist serves as a mouthpiece for the author's political views.

   • 2021 April 24, Adrian Horton, “‘The uprisings opened up the door’: the TV cop shows confronting a harmful legacy”, in The Guardian‎, →ISSN:

     Seeming “real” has been the aim since the earliest police procedurals, which began a long tradition of Hollywood productions acting as a mouthpiece for police departments.

   • 2022 November 9, Verna Yu, “Xi Jinping tells China’s army to focus on preparation for war”, in The Guardian‎:

     Xi Jinping has told the People’s Liberation Army to “focus all its energy on fighting” in preparation for war, a Chinese Communist party mouthpiece has reported.

3. (slang) A lawyer for the defense.