Definition of “cloud” - Learner’s Dictionary

cloud

verb us uk /klaʊd/
NOT CLEAR [ T ]

to make someone confused, or make something harder to understand:

to cloud / someone's judgment/vision
NOT SEEING [ I, T ]

If something transparent clouds, it becomes hard to see through, and if something clouds it, it makes it hard to see through.

See also

(Definition of “cloud verb” from the Cambridge Learner's Dictionary © Cambridge University Press)