To become covered with condensation or steam, making it hard to see through.
"My glasses steamed up the moment I walked into the warm kitchen."
To become covered in condensation or steam, or to make someone very angry or excited.
To get foggy from steam (like a mirror after a shower), or to make someone really angry.
3 meanings, ordered from most common to least. Color-coded by CEFR level.
To become covered with condensation or steam, making it hard to see through.
"My glasses steamed up the moment I walked into the warm kitchen."
To make someone angry, agitated, or very excited; often used in the passive ('get steamed up').
"Don't get so steamed up about a minor mistake — just fix it and move on."
Don't get all steamed up. It's not worth it.
— Common idiomatic usage widely attested in American English literature and film (general attribution)
To heat food or a container using steam.
"Steam up the pudding for twenty minutes before serving."
To fill up with or become covered by steam.
To get foggy from steam (like a mirror after a shower), or to make someone really angry.
The physical sense is very common in British English for glasses and windows. The emotional sense ('all steamed up') is informal and means agitated or angry; it is often used in the passive or as an adjective phrase.
Natural word combinations native speakers use most often.
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