Mutter /(?)/

imp. & p. p. Muttered; p. pr. & vb. n. Muttering

1. To utter words indistinctly or with a low voice and lips partly closed; esp., to utter indistinct complaints or angry expressions; to grumble; to growl.

   Wizards that peep, and that mutter.

   Meantime your filthy foreigner will stare, And mutter to himself.

2. To sound with a low, rumbling noise.

   Thick lightnings flash, the muttering thunder rolls.

1. To utter with imperfect articulations, or with a low voice; as, to mutter threats.

1. Repressed or obscure utterance.