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1. Talk indistinctly; usually in a low voice
   - mutter, maunder, mussitate
    
2. Grind with the gums; chew without teeth and with great difficulty
   "the old man had no teeth left and mumbled his food";
   - gum

1. A soft indistinct utterance

Derived forms: mumbles, mumbling, mumbled

Type of: chew, jaw, manducate, masticate, mouth, speak, talk, utter, utterance, verbalise [Brit], verbalize, vocalization

Encyclopedia: Mumble