you'll never know

idiom

Definition of you'll never know

: you will never be fully aware (of the extent or degree of something) You'll never know what this means to me.

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“You'll never know.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%27ll%20never%20know. Accessed 9 Mar. 2021.

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