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English definition of “fog up (something)”

fog up (something)

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