1. cool it : 放松下来；
2. play it cool : 抑制住感情, 做出冷静的样子；
3. lose one's cool : 失去镇静, 失去自制力；
4. as cool as a cucumber : 极为冷静；
5. cool down : 变凉；
6. keep one's cool : 保持镇静, 保持自制力；
形容词
不及物动词
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1. 凉的;凉爽的;温度不高的
Something that is cool has a temperature which is low but not very low.
1. great coolness and composure under strain
e.g. keep your cool
Synonym: aplombassurednesspoisesang-froid
2. the quality of being at a refreshingly low temperature
e.g. the cool of early morning