from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To utter indistinctly by lowering the voice or partially closing the mouth: mumbled an insincere apology.
- transitive v. To chew slowly or ineffectively without or as if without teeth.
- intransitive v. To speak words indistinctly, as by lowering the voice or partially closing the mouth.
- intransitive v. To chew food slowly or ineffectively, as if with the gums.
- n. A low indistinct sound or utterance.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To speak unintelligibly or inaudibly; to fail to articulate.
- n. A quiet or unintelligible vocalization.
- n. A low tone of voice.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To speak with the lips partly closed, so as to render the sounds inarticulate and imperfect; to utter words in a grumbling indistinct manner, indicating discontent or displeasure; to mutter.
- transitive v. To chew something gently with closed lips.
- transitive v. To utter with a low, inarticulate voice.
- transitive v. To chew or bite gently, as one without teeth.
- transitive v. To suppress, or utter imperfectly.
from The Century Dictionary and Cyclopedia
- To speak with the vocal organs partly closed, so as to render the sounds inarticulate and imperfect; speak in low tones, hesitatingly, or deprecatingly.
- To chew or bite softly or with the gums; work food with the gums on account of lack or defectiveness of teeth.
- To utter in a low inarticulate voice.
- To chew gently; work (food) by rubbing it with the gums on account of lack of teeth.
- To cover up or hide, as if by uttering in a mumbling, unintelligible fashion; say over inarticulately: with up.
- n. A low, indistinct utterance.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. talk indistinctly; usually in a low voice
- v. grind with the gums; chew without teeth and with great difficulty
- n. a soft indistinct utterance
Middle English momelen, from Middle Dutch mommelen.(American Heritage® Dictionary of the English Language, Fourth Edition)