mouthpiece

[mouth-pees]
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.

Origin:
1675–85; mouth + piece

ambulance chaser, mouthpiece, pettifogger, shyster.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mouthpiece (ˈmaʊθˌpiːs)
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

mouthpiece
"piece of a musical instrument that goes in the mouth," 1776, from mouth + piece. Sense of "one who speaks on behalf of others" is from 1805; in the specific sense of "lawyer" it is first found 1857.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In this case, the conundrum is how to keep your water from freezing in the
  narrow tube between your pack and the mouthpiece.
To cool the smoke, a damp cloth was placed over the mouthpiece as a filter.
He plays no part in climate change other than being a mouthpiece.
Gun-control groups accused him of being a mouthpiece for gun makers, but did
  not refute his findings.
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