a softly spoken or almost inaudible utterance
a quiet murmur of thanks
a recurring sound heard in the heart through a stethoscope that is usually a sign of disease or damage
she had been born with a heart murmur
say something in a low or indistinct voice
Nina murmured an excuse and hurried away
‘How interesting,’ he murmured quietly
make a low continuous sound
the wind was murmuring through the trees