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

 

mumble

 noun
noun
BrE BrE//ˈmʌmbl//
 
; NAmE NAmE//ˈmʌmbl//
 
 
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[usually singular] (also mumbling [countable, usually plural, uncountable]) speech or words that are spoken in a quiet voice in a way that is not clear He spoke in a low mumble, as if to himself. They tried to make sense of her mumblings. Word Origin Middle English: frequentative of mum (adjective).
See the Oxford Advanced American Dictionary entry: mumble

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