Definition of loudmouth noun from the Oxford Advanced Learner's Dictionary

 

loudmouth

 noun
noun
BrE BrE//ˈlaʊdmaʊθ//
 
; NAmE NAmE//ˈlaʊdmaʊθ//
 
(informal) Describing annoying traits
 
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a person who is annoying because they talk too loudly or too much in an offensive or stupid way See related entries: Describing annoying traits
See the Oxford Advanced American Dictionary entry: loudmouth