murmur

[mutter.n.01] as in: a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech

[murmur_vowel.n.01] as in: a schwa that is incidental to the pronunciation of a consonant

[heart_murmur.n.01] as in: an abnormal sound of the heart; sometimes a sign of abnormal function of the heart valves

[grumble.n.02] as in: a complaint uttered in a low and indistinct tone

[murmur.v.01] as in: speak softly or indistinctly

[murmur.v.02] as in: make complaining remarks or noises under one's breath

					murmur (English)
└── murmur (Middle English (1100-1500))

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