cloud up
B1 neutral inseparable intransitive
In simple words
When clouds fill up the sky, or when a glass or mirror gets all steamy and you can't see through it.
Literal meaning: To become filled ('up') with clouds ('cloud').
Meanings
1 B1 neutral
Of the sky: to become filled with clouds, often before rain.
"It was a beautiful morning, but it started to cloud up around lunchtime."
Grammar: inseparable
2 B2 neutral
Of a glass surface or eyes: to become misty, blurred, or obscured.
"The bathroom mirror clouded up from the steam as soon as she started the shower."
Grammar: inseparable
Usage notes
The weather sense is very similar to 'cloud over.' The sense of a surface becoming opaque is slightly different and often applied to glass, lenses, or eyes. Common in everyday American and British English.
Commonly used with
sky glass mirror eyes weather lens
Forms
Base
cloud up
I/you/we/they
3rd person
clouds up
he/she/it
Past simple
clouded up
yesterday
Past participle
clouded up
have + pp
-ing form
clouding up
continuous
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