cool off

verb6

1. •
   To decrease in temperature, activity, or temper.

   • You are getting a little too angry; you need to cool off.
   • The metal will take about three hours to cool off after the molding.
2. •
   To cause to decrease in temperature, activity or temper.

   • At first he was very angry, but his friends managed to cool him off.
3. •
   To lose interest or enthusiasm [with on].

   • While talking about freight, I must express my regret that the Government seem to be cooling off on the Channel Tunnel. — 1974
4. •
   (slang) To wait for a furor to die down; to hide during a police manhunt.

   • After doing the job, he went to the safehouse to cool off.
5. •
   To be imprisoned.

   • He's cooling off in the state pen.
6. •
   (slang) To kill (someone).