cool off

Short definition from Wiktionary

Verb

1. 1
   To decrease in temperature, activity, or temper.
2. 2
   To cause to decrease in temperature, activity or temper.
3. 3
   To lose interest or enthusiasm [with on].
4. 4
   To be imprisoned.
5. 5
   To kill (someone).
6. 6
   To wait for a furor to die down; to hide during a police manhunt.