Definition of "cool down"

(intransitive)

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

2. To become less agitated or excited.  examples

3. To decrease in degree or intensity.  quotations  examples

   Quotations

   • The increase in spending in the United States last month follows a revised 1.4 percent month-over-month gain in March, when prices for gasoline soared amid Russia’s invasion of Ukraine. Gas prices cooled down slightly in April but were still at elevated levels, while oil prices remain volatile.

     2022 May 17, Coral Murphy Marcos, “Retail sales rise for the fourth straight month as prices keep climbing.”, in The New York Times‎

(transitive)

1. To cause (something) to become cooler; to reduce the temperature of.  examples

2. To cause (someone) to become less agitated or excited.  quotations  examples

   Quotations

   • I'm oversexed. Write me and see if you can cool me down.

     1984 April 21, J. F. Peoples, “Personal Advertisement”, in Gay Community News, page 19