1. murmur
He murmured sweet nothings in her ear
When I asked him if everything was all right, he just murmured something and left the room.
"Go to sleep now," she murmured.
There was a murmur when she entered the room.
Inglese parola "to speak or say something very quietly"(murmur) si verifica in set:
SB p. 95, 96, 97