verb / interjection / noun
shush
SHUSH/ʃʌʃ/
A sound or command telling someone to be quiet.
She shushes the speaker beside the sleeping infant.

Etymology
The silence-requesting sound sh was expanded into the command shush. That command then became a verb for telling or compelling someone to be quiet with the same sound.
In context
oh you're saying shush don't shush me shush what do you think that sound could be