frost up
B1 neutral inseparable both
In simple words
When frost forms on a window, windscreen, or other surface on a cold day.
Literal meaning: To frost over the top — largely transparent.
Meanings
1 B1 neutral
For a surface to become covered with a thin layer of frost or ice during cold weather.
"The car windscreen had frosted up overnight and I had to scrape it before driving."
Grammar: inseparable
2 B2 neutral
To deliberately coat a glass surface with a frosted or opaque finish.
"They frosted up the bathroom window to give more privacy without blocking the light."
Grammar: separable
Usage notes
Used commonly in British English to describe windows, windscreens, and outdoor surfaces. 'The windscreen has frosted up' is a typical use. Also used transitively: 'The cold frosted up the windows'.
Commonly used with
windscreen window pipes roads glass surface
Forms
Base
frost up
I/you/we/they
3rd person
frosts up
he/she/it
Past simple
frosted up
yesterday
Past participle
frosted up
have + pp
-ing form
frosting up
continuous
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Synonyms
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