| murmur | (noun) a complaint uttered in a low and indistinct tone | Synonyms: grumble, grumbling, murmuring, mutter, muttering |
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| (noun) a schwa that is incidental to the pronunciation of a consonant | Synonyms: murmur vowel |
| (noun) a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech | Synonyms: murmuration, murmuring, mussitation, mutter, muttering |
| (noun) an abnormal sound of the heart; sometimes a sign of abnormal function of the heart valves | Synonyms: cardiac murmur, heart murmur |
| (verb) speak softly or indistinctly | - |
| (verb) make complaining remarks or noises under one's breath | Synonyms: croak, gnarl, grumble, mutter |