Dictionary

mouthpiece

noun mouth·piece \-ˌpēs\

: a part of something that is placed between or near your lips

: someone who speaks for another person or for a group or organization

Full Definition of MOUTHPIECE

1
:  something placed at or forming a mouth
2
:  a part (as of an instrument) that goes in the mouth or to which the mouth is applied
3
a :  one that expresses or interprets another's views :  spokesman
b slang :  a criminal lawyer

Examples of MOUTHPIECE

  1. the mouthpiece of a trumpet
  2. He's been acting as a mouthpiece for the government on questions of foreign policy.
  3. The company has hired an attorney as a mouthpiece to answer its critics.

First Known Use of MOUTHPIECE

1678

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