Meaning of “big mouth” in the English Dictionary

british dictionary

"big mouth" in British English

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big mouthnoun [ C usually singular ]

uk /ˈbɪɡ ˌmaʊθ/ us /ˈbɪɡ ˌmaʊθ/ informal disapproving

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.
I'm sorry. I wasn't supposed to tell you! Me and my big mouth!

(Definition of “big mouth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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