(mumbles, mumbling, mumbled)
If you mumble, you speak very quietly and not at all clearly with the result that the words are difficult to understand.
Her grandmother mumbled in her sleep...
He mumbled a few words...
'Today of all days,' she mumbled.
VERB: V, V n, V with quote
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Mumble is also a noun.
He could hear the low mumble of Navarro's voice.
N-COUNT