cloud · noun /klɑʊd/Full view
cloud (WATER)
A2 C or U a white or gray mass in the sky, made of very small drops of water
Dictionary examples:

Do you think those are rain clouds on the horizon?

The sky was a perfect blue - not a cloud in sight.

Dark clouds gathered overhead.

Learner example:

Except for the first day, the sun was with us all the time, with absolutely no cloud in the sky. (Preliminary English Test; B1; French)

cloud (SMOKE/DUST)
B2 C a mass of something such as dust or smoke that looks like a cloud
Dictionary example:

A huge cloud of smoke from burning oil tanks stretched across the sky.

Learner example:

Some of them leave behind a large cloud of smoke and it damage[s] our health. (First Certificate in English; B2; Spanish)

be on cloud nine
C2 to be extremely happy and excited
Dictionary example:

When I heard I got the job, I was on cloud nine!

Learner example:

But now, after the promise in which both said "yes," she was on cloud nine. (Certificate of Proficiency in English; C2; German)

cloud · verb /klɑʊd/
C2 T to make someone confused, or make something harder to understand
Dictionary example:

to cloud someone's judgment/vision

Learner example:

Having their judgment somewhat clouded by hormones should not take precedence over all other concerns. (International English Language Testing System; C2; Hebrew)

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