if one knows what's good for one

idiom

Definition of if one knows what's good for one

: if a person wants to avoid trouble, problems, etc. You'll take my advice if you know what's good for you. She'll forget about the whole thing if she knows what's good for her.

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“If one knows what's good for one.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/if%20one%20knows%20what%27s%20good%20for%20one. Accessed 29 Sep. 2020.

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