lowmurmur
nounUK /ˈləʊˌmɜːmə/
US /ˈloʊˌmɜːrmər/
A low murmur is a soft, quiet sound that people make when they talk in a low voice.
A lowmurmur of voices came from the next room.
OTHER MEANINGS
2. A soft, steady sound like water or wind moving gently.
The lowmurmur of the stream helped her fall asleep.
3. A quiet complaint or grumble said in a low voice.
There was a lowmurmur of complaint from the crowd.
4. A soft, continuous background noise.
The lowmurmur of the engine filled the car.