cool down

verb5

1. •
   To become cooler; to be reduced in temperature.

   • You can drink the coffee when it's cooled down.
2. •
   To cause (something) to become cooler; to reduce the temperature of.

   • We had to cool down the equipment with water before using it.
3. •
   To become less agitated or excited.

   • I'd love to go to Israel, but I'll have to wait until the violence cools down.
4. •
   To decrease in degree or intensity.
5. •
   To cause (someone) to become less agitated or excited.

   • Dave was kicking and screaming, so I had to cool him down with some mellow music.