American English

Definition of loudmouth noun from the Oxford Advanced American Dictionary

 

loudmouth

 noun
noun
NAmE//ˈlaʊdmaʊθ//
 
(informal)
 
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a person who is annoying because they talk too loudly or too much in an offensive or stupid way
loud-mouthed
 
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NAmE//ˈlaʊdmaʊðd//
 
, NAmE//ˈlaʊdmaʊθt//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: loudmouth