mouthpiece

noun

mouth·​piece ˈmau̇th-ˌpēs 

1

: something placed at or forming a mouth

2

: a part (as of an instrument) that goes in the mouth or to which the mouth is applied

3

a

: one that expresses or interprets another's views : spokesperson

b

slang : a criminal lawyer

Synonyms of mouthpiece

• spokesperson
• spokesman

Examples of mouthpiece in a Sentence

the mouthpiece of a trumpet

He's been acting as a mouthpiece for the government on questions of foreign policy.

The company has hired an attorney as a mouthpiece to answer its critics.

Recent Examples on the Web

Its cover features Jackson wearing headphones and biting down on a mouthpiece as if she’s being prepped for shock treatment. — Brian Niemietz, New York Daily News, 18 Aug. 2026

Scrub the lid, mouthpiece, straw, and rubber seals with warm water and mild dish soap. — Beth Ann Mayer, Parents, 17 Aug. 2026

During rehearsals, a modern mouthpiece was placed on the end of the silver trumpet to play it. — Sheena McKenzie, CNN Money, 10 Aug. 2026

Sick of It All were NYHC’s most welcoming emissaries, and their mouthpiece was Lou Koller, whose death was announced Friday. — Kory Grow, Rolling Stone, 25 July 2026

Word History

First Known Use

1673, in the meaning defined at sense 1

Rhymes for mouthpiece

• apiece
• aris
• assise
• caprice
• cerise
• decease
• decrease
• eyepiece
• facepiece
• handpiece
• headpiece
• increase

Kids Definition

mouthpiece

noun

mouth·​piece -ˌpēs 

1

: the part put to, between, or near the lips

the mouthpiece of a trumpet

the mouthpiece of a telephone

2

: someone who expresses another person's ideas : spokesperson