1. To grind with the gums; chew without teeth and with great difficulty; of babies and old people; SYN. gum.
2. To talk indistinctly; usually in a low voice; SYN. mutter, maffle, maunder, mussitate.
3. To chew or bite with or as if with toothless gums

1. To utter words indistinctly or with a low voice and lips partly closed; esp., to grumble; to complain under one's breath.
2. To sound with a low, rumbling noise.