mouthpiece

(-pēs′)

noun

  1. a part placed at, or forming, a mouth: the mouthpiece of a telephone, a pipe, a horse's bit, etc.
  2. the part of a musical instrument held in or to the mouth
  3. a person, periodical, etc. used by some other person or persons to express their views, ideas, etc.
  4. Slang a lawyer who defends criminals

See mouthpiece in American Heritage Dictionary 4

noun
  1. A part, as of a musical instrument or a telephone, that functions in or near the mouth.
  2. Sports A protective rubber device worn over the teeth, as by boxers.
  3. Informal One, such as a spokesperson, through which views are expressed.
  4. Slang A defense lawyer.

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