What does "mumble" mean?

Mumble: To chew something gently with closed lips.

Additional senses

  1. 2.To utter with a low, inarticulate voice. Bp. Hall.
  2. 3.To chew or bite gently, as one without teeth. Gums unarmed, to mumble meat in vain. Dryden.
  3. 4.To suppress, or utter imperfectly.

Sources