mumble

To utter indistinctly by lowering the voice or partially closing the mouth.

To chew slowly or ineffectively without or as if without teeth.

To speak words indistinctly, as by lowering the voice or partially closing the mouth.

To chew food slowly or ineffectively, as if with the gums.

A low indistinct sound or utterance.

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.