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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.
(Definition of steam (sth) up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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