v.1. To cool to a comfortable and agreeable degree of heat: The kids jumped in the lake to cool off.
2. To cool something or someone to a comfortable and agreeable degree of heat: The air conditioner cooled off the building. My soup was hot, but blowing on it cooled it off.
3. To become calm after a period of anger or conflict: Have things cooled off in that part of the world?
4. To calm someone or something that is angry or contentious: The coach took the angry players aside and cooled them off. The counselor cooled off the fighting campers.
5. To have a period of outstanding performance come to an end: They scored ten points in the first half of the game but cooled off in the second. The stock market cooled off after the latest unemployment report was released.
6. To lose passion: Their romance has cooled off.