RhymeZone: muttered definitions

Definitions of mutter:

noun: a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
noun: a complaint uttered in a low and indistinct tone
verb: make complaining remarks or noises under one's breath
verb: talk indistinctly; usually in a low voice
name: A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #10862)

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See mutter used in context: 9 rhymes, 1 Shakespeare work, several books and articles.