cool off

US /kuːl ˈɔːf/
UK /kuːl ˈɔːf/
"cool off" picture
1.

to become less hot, or to make something less hot

:
Let the soup cool off before you eat it.
The engine needs to cool off after a long drive.
2.

to become calm after being angry or excited

:
He needs some time to cool off before we discuss this.
After the argument, she went for a walk to cool off.