Meaning of “mumble” in the English Dictionary

british dictionary

(Definition of “mumble” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mumble" in American English

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mumbleverb [ I/T ]

us /ˈmʌm·bəl/

to speak quietly or in an unclear way so that the words are difficult to understand:

[ T ] She mumbled something about needing to be home, then left.
[ I ] He often mumbles, and I never know what he’s asking me.

(Definition of “mumble” from the Cambridge Academic Content Dictionary © Cambridge University Press)