Meaning of “in your dreams!” in the English Dictionary

british dictionary

"in your dreams!" in British English

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in your dreams!

humorous

something you say to someone who has just told you about something they are hoping for, in order to show that you do not believe it will happen:

Dave, buy you a car? In your dreams!

(Definition of “in your dreams!” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)