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

 

blabbermouth

 noun
noun
BrE BrE//ˈblæbəmaʊθ//
 
; NAmE NAmE//ˈblæbərmaʊθ//
 
(informal, disapproving)
 
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a person who tells secrets because they talk too much
See the Oxford Advanced American Dictionary entry: blabbermouth