"mumble" in the noun sense
1. mumble
a soft indistinct utterance
"mumble" in the verb sense
1. mumble, mutter, maunder, mussitate
talk indistinctly usually in a low voice
2. mumble, gum
grind with the gums chew without teeth and with great difficulty
"the old man had no teeth left and mumbled his food"
Source: WordNet® (An amazing lexical database of English)
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