Definitions
1.verbTo grumble; to complain in a low, muttering voice, or express discontent at or against someone or something.
2.verbTo speak or make low, indistinguishable noise; to mumble, mutter."I couldn't hear the words; he just murmured a lot."
3.verbTo say (something) indistinctly, to mutter.
4.nounA sound that murmurs."the murmurings of trees in the wind"
5.nounA complaint against something.