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English definition of “steam (sth) up”

steam (sth) up

verb uk phrasal verb with steam   /stiːm/ us  
If glass or something with a glass or similar surface steams up, it becomes covered with a thin layer of water caused by steam touching it, and if you steam it up, you cause this to happen: The bathroom mirror steamed up during my shower. Going into the warm room steamed my glasses up.Clouds, dew, fog and steam
(Definition of steam (sth) up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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