MOUTHPIECE

[noun] [C] - the part of a telephone, musical instrument or other device that goes near or between the lips"Shall I say you're not here?" she whispered, holding her hand over the mouthpiece.To play the recorder, blow gently into the mouthpiece.See pictures: Mouths, Brass instrumentsA mouthpiece is also a person or a newspaper that expresses the opinions of others.He has become a mouthpiece for/of the company.(disapproving) This newspaper is just a Republican mouthpiece.