cloud over

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

曇る, 暗くなる

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.
悪い知らせを聞いて、彼女の顔は曇った
His expression clouded over as he considered the implications.
彼はその影響を考えると、表情が曇った
2.

曇る, 雲で覆われる

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.
空が曇り始め、雨が降りそうな気配だった。
It was a beautiful morning, but by afternoon, it had clouded over.
美しい朝だったが、午後には曇ってしまった