Definition of motormouth noun from the Oxford Advanced American Dictionary

 

motormouth

 noun
noun
NAmE//ˈmoʊt̮ərˌmaʊθ//
 
(pl. motormouths
NAmE//ˈmoʊt̮ərˌmaʊðz//
 
)
(informal)
 
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a person who talks loudly and too much
See the Oxford Advanced Learner's Dictionary entry: motormouth