mouthpiece

Universal Words noun 1 the part of the telephone that is next to your mouth when you speak: He put his hand over the mouthpiece and called his wife to the phone. 2 the part of a musical instrument that you place between your lips 3 ~ (of / for sb) a person, newspaper, etc. that informs the public about the opinions of a group of people or a political organization: The newspaper has become the official mouthpiece of the opposition party.