you know what they say

idiom

Definition of you know what they say

informal
used to introduce a common saying or a statement that expresses a common beliefKeep trying, and you'll figure it out. You know what they say: if at first you don't succeed, try, try again.

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“You know what they say.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%20know%20what%20they%20say. Accessed 19 Sep. 2020.

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