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Definition of: MUTTER
- (n.) Repressed or obscure utterance.
- (v. i.) 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.
- (v. i.) To sound with a low, rumbling noise.
- (v. t.) To utter with imperfect articulations, or with a low voice; as, to mutter threats.