Longman Dictionary of Contemporary English homepage

mouthpiece

noun
     
mouthpiece
mouth‧piece [countable]
1APMTCT the part of a musical instrument, telephone etc that you put in your mouth or next to your mouth:
Ben put his hand over the mouthpiece and shouted to me.
2 [usually singular]PG a person, newspaper etc that expresses the opinions of a government or a political organization
mouthpiece of
The newspaper was the mouthpiece of the National Democratic Party.

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