Meaning of “fog up (something)” in the English Dictionary

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"fog up (something)" in American English

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fog up (something)

phrasal verb with fog /fɔɡ, fɑɡ/ verb [ T/I ] -gg-

to cover a surface such as glass or a mirror with small drops of water and make it difficult to see through or reflect an image:

My windshield kept fogging up, and it was hard to see the road.
The steam fogged my glasses up.

(Definition of “fog up (something)” from the Cambridge Academic Content Dictionary © Cambridge University Press)