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grumbling, murmur, grumble, murmuring, mutter, muttering | a complaint uttered in a low and indistinct tone | ||
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murmuring, susurrant, whispering | making a low continuous indistinct sound | ||
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murmur, murmuring, muttering, mutter, murmuration, mussitation | a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech |