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Definition of mouthpiece:

  1. An appendage to an inlet or outlet opening of a pipe or vessel, to direct or facilitate the inflow or outflow of a fluid.
  2. One who delivers the opinion of others or of another; a spokesman; as, the mouthpiece of his party.
  3. The part of a musical or other instrument to which the mouth is applied in using it; as, the mouthpiece of a bugle, or of a tobacco pipe.

Synonyms:

backtalk, counselor, rima oris, lawyer, spokesperson, back talk, lip, gumshield, adviser, speaker, embouchure, sass, mouth, oral cavity, oral fissure, sassing.

Usage examples: