cool off

verb cools off · cooling off · cooled off

1. intransitive To decrease in temperature, activity, or temper. You are getting a little too angry; you need to cool off.
2. transitive To cause to decrease in temperature, activity or temper. At first he was very angry, but his friends managed to cool him off.
3. intransitive 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.
4. intransitive To be imprisoned. He's cooling off in the state pen.
5. slang, transitive To kill (someone).
6. intransitive, 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.