Simmer down

You need to simmer down and stop yelling at me.

It took a while for the heated debate to simmer down and for people to start listening to each other.

"Silence! Now ye had better go slow, my good fellow. This is two or three times you've tried to get off some of your insolence. Lip won't do here. You've got to simmer down."

The agitation, thus deprived of its chief hope, might very well have been expected to simmer down, to die away slowly.

Although the street demonstrations have simmered down, protests have continued in other forms.