you/he/she must be joking
idiom
—used say that what someone is saying is very surprising or hard to believe
"He said the report is due by tomorrow." "He must be joking."
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“You/he/she must be joking.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%2Fhe%2Fshe%20must%20be%20joking. Accessed 21 Dec. 2024.
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Merriam-Webster unabridged
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