A soft, low, or indistinct sound produced by a person or group of people speaking quietly or at a distance. The murmuring of the crowd could be heard from the other side of the room.
A continuous, low sound, often made by water or wind. The murmuring of the stream was soothing as we sat by the riverbank.
A subdued or private expression of discontent or dissatisfaction. There was a murmuring among the employees about the new company policy.