Definition of murmurs:
(n) :
(countable, uncountable) Any low, indistinct sound, like that of running water.
(n) :
(countable, uncountable) Soft indistinct speech.
(v) :
(intransitive) To speak or make low, indistinguishable noise; to mumble, mutter.
(v) :
(transitive) To say (something) indistinctly, to mutter.
(n) :
A muttered complaint or protest; the expression of dissatisfaction in a low muttering voice; any expression of complaint or discontent.
(n) :
(cardiology, medicine) The sound made by any condition which produces a noisy, or turbulent, flow of blood through the heart.