American English

Definition of big mouth noun from the Oxford Advanced American Dictionary

 

big mouth

 noun
(also bigmouth) noun
 
(informal)
 
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  • a person who talks a lot, especially about himself or herself, and who cannot keep secrets
  • Idioms
      have a big mouth
       
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    1. 1In this idiom the main stress is on mouth. to be bad at keeping secrets
    2. 2to talk too much, especially about your own abilities and achievements
    me and my big mouth
     
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    In this idiom the main stress is on mouth. (informal) used when you realize that you have said something that you should not have said
    big-mouthed
     
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    NAmE//ˈbɪɡ maʊθt//
     
    , NAmE//ˈbɪɡmaʊðd//
     
    adjective
    See the Oxford Advanced Learner's Dictionary entry: big mouth