Meaning of “cloud over/up” in the English Dictionary

american-english dictionary

"cloud over/up" in American English

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cloud over/up

phrasal verb with cloud us /klɑʊd/ verb [ T ]

to become filled with clouds:

The sky clouded over, and you could hear thunder in the distance.
It looks like it's clouding up (= the sky is becoming filled with clouds).

(Definition of “cloud over/up” from the Cambridge Academic Content Dictionary © Cambridge University Press)