mumble
1. [ verb ] talk indistinctly; usually in a low voice
Synonyms: mutter mussitate maunder maffle
Related terms: talk mutter mutterer mumbling
2. [ verb ] (food) grind with the gums; chew without teeth and with great difficulty
Synonyms: gum
Examples:

"the old man had no teeth left and mumbled his food"

Related terms: chew gingiva
Similar spelling:   mumbler
  mumbling