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English definition of “steam (sth) up”

steam (sth) up

phrasal verb with steam     /stiːm/ verb
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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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