can't be serious

idiom

Definition of can't be serious

used to express disbelief about what someone said"I'm joining the army." "You can't be serious."

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“Can't be serious.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/can't%20be%20serious. Accessed 24 Feb. 2020.

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