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to cool; to chill; to refrigerate
to calm down; to cool off; to regain one's composure; to relax
to be frightened (at); to be scared (of)
ビールを冷蔵庫で冷やしておいてください。
Please chill the beer in the refrigerator.
怒った時は頭を冷やすほうがいい。
When angry, it is better to cool your head.
暑いので冷たい水で体を冷やしたいです。
It's hot, so I want to cool my body with cold water.