King James Bible

MUT'TER, verb intransitive [Latin mutio, muttio, and musso, mussito; allied perhaps to muse, which see.]

1. To utter words with a low voice and compressed lips, with sullenness or in complaint; to grumble; to murmur.

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.

MUT'TER, verb transitive To utter with imperfect articulations, or with a low murmuring voice.

Your lips have spoken lies, your tongue hath muttered perverseness. Isaiah 59:3.

They in sleep will mutter their affairs.

MUT'TER, noun Murmur; obscure utterance.