cloud up
Intermediate (B1)neutral
When clouds fill up the sky, or when a glass or mirror gets all steamy and you can't see through it.
"It was a beautiful morning, but it started to cloud up around lunchtime."
Hear it in context
The Wiggly Wonder of Music | Jacob Collier | TED
TED · 5:35
"Clouds are white," there's a little cloud up there.
The Industrialist's Dilemma: Beth Comstock, Chief Marketing Officer of GE
Stanford Graduate School of Business · 14:05
But again, if you're opening your platform, your Cloud up to them,