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English definition of “you must be joking”

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you must be joking

( also you've got to be joking)
B1 said in answer to something that someone has said, meaning that you do not believe they need said it seriously, or you think it is a stupid thing to say: You've got to be joking if you think I'm going to stand in the rain watching you play tennis!
Translations of “you must be joking”
in Chinese (Traditional) (表示不相信或覺得荒謬)你一定是在開玩笑吧…
in Chinese (Simplified) (表示不相信或觉得荒谬)你一定是在开玩笑吧…
(Definition of you must be joking from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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