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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Cite this Entry

“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 Feb. 2024.

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