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to speak in a low, soft voice, often in a way that is difficult to hear or understand
to express discontent or complain about someone or something in a quiet, subdued manner
a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
a schwa that is incidental to the pronunciation of a consonant
a complaint uttered in a low and indistinct tone
an abnormal sound of the heart; sometimes a sign of abnormal function of the heart valves