murmur

US /ˈmɝː.mɚ/
UK /ˈmɝː.mɚ/
1.

thì thầm

to speak or say something very quietly:

:
"I love you," she murmured.
1.

thì thầm

the sound of something being said very quietly:

:
A murmur of agreement came from the crowd.