cool down phrasal verbphr v a) to make something slightly colder, or to become slightly colder （使）冷却下来，（使）变凉 The air has cooled down a little now. 现在空气稍稍变凉了一点。
cool somebody/something ↔ down A cold beer will cool you down. 一杯冰啤酒会让你凉快下来。
b) CALMto become calm after being angry 冷静下来 After I cooled down I realized I had been wrong. 等我冷静下来之后，我认识到我错了。
cool down• If the engine overheats, switch it off and do not start it again until it has cooled down.• It's been hot all summer, but it's finally starting to cool down a little.
→ cool down at cool2(3)