What is the meaning of Murmur?

Any low, indistinct sound, like that of running water.

Soft indistinct speech.

The sound made by any condition which produces a noisy, or turbulent, flow of blood through the heart.

A muttered complaint or protest; the expression of dissatisfaction in a low muttering voice; any expression of complaint or discontent.

To grumble; to complain in a low, muttering voice, or express discontent at or against someone or something.

To speak or make low, indistinguishable noise; to mumble, mutter.

To say (something) indistinctly, to mutter.

murmur, murmuring

humming, roaring, rumbling, growling, grumbling

rushing, crashing

A whining, protesting or complaining in the background; murmuring.

Background noise or sounds.

first-person singular present indicative/subjunctive of murmura

a murmur

Source: wiktionary.org