murmur
Definitions
A soft, indistinct sound made by a person or group of people speaking quietly or at a distance.
A low, continuous, and regular sound, such as that of a stream or the wind.
A soft blowing or rasping sound heard on auscultation of the heart, typically caused by turbulent blood flow.
Examples
A soft murmur of voices drifted from the crowded room.
The brook continued to murmur as it flowed over the smooth river stones.
She could only murmur a quiet thank you before turning away.