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 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.
6.verbTo speak or make low, indistinguishable noise; to mumble, mutter."I couldn't hear the words; he just murmured a lot."
7.verbTo say (something) indistinctly, to mutter.