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Definition of big mouth noun from the Oxford Advanced Learner's Dictionary

big mouth

noun

/ˈbɪɡ maʊθ/

/ˈbɪɡ maʊθ/

(informal)

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a person who talks a lot, especially about him- or herself, and who cannot keep secrets

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See big mouth in the Oxford Advanced American Dictionary

Check pronunciation: big mouth

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B2

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