To Get Cloudy
To Become Cloudy, To Get Fogged Up, To Cloud Up
intransitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means cloudy and the verb vocab version means to get cloudy or to become cloudy.
Aside from describing the weather, 曇る can also refer to other physical phenomena, like when your glasses or bathroom mirror gets fogged up. It can also be used figuratively, such as when someone's expression clouds over (表情が曇る) due to a negative emotion.
The reading is the same as the one you learned with the kanji. It also happens to be the same as 雲, which has a very similar meaning (clouds).
空が曇る
the sky gets cloudy
目が曇る
one's judgment gets clouded
表情が曇る
one's expression clouds over
顔が曇る
one's face darkens
眼鏡が曇る
glasses fog up
どんより曇る
to become heavily overcast
少し曇る
to cloud over a little
やや曇る
to become somewhat cloudy
にわかに曇る
to suddenly cloud over
うっすら曇る
to become faintly cloudy
空が急に曇ってきた。
The sky suddenly got cloudy.
やばい！フロントガラスが曇って外が見えない。
Oh no! The windshield is fogged up and I can't see outside.
ラーメンの湯気で眼鏡が曇っちゃうのが好きじゃないんだよね。
I don't like it when ramen steam fogs up my glasses.
話しているうちに、彼女の表情が少しずつ曇っていった。
As we talked, my girlfriend's expression gradually darkened.
彼への尊敬や憧れで目が曇っていたのだと思います。
I think my judgment was clouded by the respect and admiration I felt for him.