a quiet and indistinct utterance:Rosie had replied in a mumble
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Universal
1 [reporting verb] say something indistinctly and quietly, making it difficult for others to hear: [with object]:he mumbled something she didn’t catch [with direct speech]:‘Sorry,’ she mumbled
2 [with object] bite or chew (something) with toothless gums or without making much use of the teeth:she mumbled a piece of black bread