you have no idea

idiom

Definition of you have no idea

used to emphasize an agreement with something just said"Was it hard?" "You have no idea (how hard it was)!"

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“You have no idea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%20have%20no%20idea. Accessed 25 Oct. 2020.

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