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English definition of “you must be joking”

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 rugby!
(Definition of you must be joking from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Translations of “you must be joking”

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