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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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  1. a person who talks a lot, especially about him- or herself, and who cannot keep secrets
See big mouth in the Oxford Advanced American Dictionary
trait
noun
 
 
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