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mouthpiece

[mouth-pees]
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noun
  1. a piece placed at or forming the mouth, as of a receptacle or tube.
  2. a piece or part, as of an instrument, to which the mouth is applied or which is held in the mouth: the mouthpiece of a trumpet.
  3. the part of a bit or bridle, as for a horse, that passes through the animal's mouth.
  4. a person, newspaper, etc., that conveys the opinions or sentiments of others; spokesperson.
  5. Slang. a lawyer, especially a criminal lawyer.
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Origin of mouthpiece

First recorded in 1675–85; mouth + piece
Can be confusedambulance chaser mouthpiece pettifogger shyster
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for mouthpiece

mouthpiece

noun
  1. the part of a wind instrument into which the player blows
  2. the part of a telephone receiver into which a person speaks
  3. the part of a container forming its mouth
  4. a person who acts as a spokesman, as for an organization
  5. a publication, esp a periodical, expressing the official views of an organization
  6. boxing another name for gumshield
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mouthpiece

n.

also mouth-piece, 1680s, "casting fitted on an open end of a pipe, etc.," from mouth (n.) + piece (n.). Meaning "piece of a musical instrument that goes in the mouth" is from 1776. Sense of "one who speaks on behalf of others" is from 1805; in the specific sense of "lawyer" it is first found 1857.

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Online Etymology Dictionary, © 2010 Douglas Harper