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English to English noun
| 1 |
a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech |  | source: wordnet30
| 2 |
a complaint uttered in a low and indistinct tone | | source: wordnet30
| 3 |
Repressed or obscure utterance. | | source: webster1913
verb
| 4 |
talk indistinctly; usually in a low voice | | source: wordnet30
| 5 |
make complaining remarks or noises under one's breath | | Example: she grumbles when she feels overworked
source: wordnet30
| 6 |
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. | | source: webster1913
| 7 |
To utter with imperfect articulations, or with a low voice; as, to mutter threats. | | source: webster1913
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