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A low, indistinct, continuous sound: spoke in a murmur; the murmur of the waves.
(noun)
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An indistinct, whispered, or confidential complaint; a mutter.
(noun)
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Medicine An abnormal sound, usually emanating from the heart, that sometimes indicates a diseased condition.
(noun)
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To make a low, continuous, indistinct sound or succession of sounds.
(verb-intransitive)
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To complain in low mumbling tones; grumble.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.