fog up

US /fɑːɡ ʌp/
UK /fɑːɡ ʌp/
"fog up" picture
1.

起雾, 模糊

to cover with a film of condensed water vapor, as from breath or steam, making it difficult to see through

:
The bathroom mirror always fogs up after a hot shower.
洗完热水澡后,浴室镜子总是起雾
My glasses fogged up when I came inside from the cold.
我从外面冷的地方进来时,眼镜起雾了
2.

模糊, 混乱

to become confused or unclear in thought or understanding

:
My mind tends to fog up when I'm tired.
我累的时候,思绪容易模糊
The complex instructions made my brain fog up.
复杂的说明让我的大脑一片模糊