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English definition of “big mouth”

big mouth

noun [C usually singular]     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.People who reveal secrets and tell tales
(Definition of big mouth noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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