mum•blePronunciation: (mum'bul), [key]
—v., -bled, -bling,
to speak in a low indistinct manner, almost to an unintelligible extent; mutter.
to chew ineffectively, as from loss of teeth: to mumble on a crust.
to say or utter indistinctly, as with partly closed lips: He mumbled something about expenses.
to chew, or try to eat, with difficulty, as from loss of teeth.
a low, indistinct utterance or sound.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.