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English definition of “mumble”

mumble

verb [I or T]     /ˈmʌm.bl̩/
B2 to speak quietly and in a way that is not clear so that the words are difficult to understand: She mumbled something about being too busy. [+ speech] "I'm sorry," he mumbled.Ways of talking
(Definition of mumble verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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