1the part of a musical instrument, telephone, etc. designed to be put in or against the mouth:he shouted into the mouthpiece, but there was no responsethe snorkel’s mouthpiece
a gumshield:he yanked out his brother’s mouthpiece so he could breathe through all the blood
2chiefly derogatory a person or organization who speaks on behalf of another person or organization:the media acts as a mouthpiece for the Party
North American informal a lawyer:his attorney isn’t one of those cheap mouthpieces you see on a billboard
