To say (something) indistinctly, to mutter.
To speak or make low, indistinguishable noise; to mumble, mutter.
The sound made by any condition which produces 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.
Soft indistinct speech.
Any low, indistinct sound, like that of running water.
To say one's thoughts aloud, particularly while also not conversing with anyone else.