Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “big mouth”

big mouth

noun [C usually singular] uk   informal disapproving us  
If someone is or has a big mouth, they often say things that are meant to be kept secret: He is/has such a big mouth. He went and opened his big mouth and told them the whole story.People who reveal secrets and tell tales
(Definition of big mouth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of big mouth?
Add Cambridge dictionaries to your browser to your website

Translations of “big mouth”

Word of the Day

blueprint

a photographic copy of an early plan for a building or machine

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More