cloud over

US /klaʊd ˈoʊvər/
UK /klaʊd ˈoʊvər/
"cloud over" picture
1.

陰沉下來, 變暗

If a person's face clouds over, it shows that they are sad or angry.

:
Her face clouded over when she heard the bad news.
聽到壞消息時,她的臉陰沉下來
His expression clouded over as he considered the implications.
他考慮後果時,表情陰沉下來
2.

陰雲密布, 多雲

If the sky or the weather clouds over, it becomes covered with clouds and looks as if it is going to rain.

:
The sky began to cloud over, threatening rain.
天空開始陰雲密布,預示著要下雨。
It was a beautiful morning, but by afternoon, it had clouded over.
那是一個美麗的早晨,但到了下午,天空就陰沉下來了。