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English definition of “steam (sth) up”

steam (sth) up

phrasal verb with steam
 
 
/stiːm/ verb
If glass steams up, or if you steam it up, it becomes covered in steam: The mirror in the bathroom steamed up.Clouds, dew, fog and steam
(Definition of steam (sth) up from the Cambridge Learners Dictionary © Cambridge University Press)
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