Definitions
1.NounAny low, indistinct sound, like that of running water.
2.NounSoft indistinct speech."A murmur arose from the audience."
3.NounThe sound made by any condition which produces a noisy, or turbulent, flow of blood through the heart.
4.NounA muttered complaint or protest; the expression of dissatisfaction in a low muttering voice; any expression of complaint or discontent.
5.VerbTo grumble; to complain in a low, muttering voice, or express discontent at or against someone or something. .mw-parser-output .defdate{font-size:smaller}
6.VerbTo speak or make low, indistinguishable noise; to mumble, mutter."I couldn't hear the words; he just murmured a lot.; The bees murmured in the forest. The waves murmured on the shore."
7.VerbTo say (something) indistinctly, to mutter.