murmuring

US /ˈmɝː.mɚ.ɪŋ/
UK /ˈmɝː.mɚ.ɪŋ/
1.

Murmeln

the sound of one or more people talking quietly, or the things that they say:

:
There was some embarrassed murmuring and then he put the note down.
1.

Murmeln

talking quietly:

:
All was silent except for murmuring voices.