Meaning of “steam (sth) up” in the English Dictionary

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"steam (sth) up" in British English

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steam (sth) up

phrasal verb with steam uk /stiːm/ us /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.

(Definition of “steam (sth) up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)