- To speak with the lips partly closed, so as to render the sounds inarticulate and imperfect; to utter words in a grumbling indistinct manner, indicating discontent or displeasure; to mutter.
- To chew something gently with closed lips.
- To utter with a low, inarticulate voice.
- To chew or bite gently, as one without teeth.
- To suppress, or utter imperfectly.