if one knows what's good for one
idiom
: 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 25 Apr. 2024.
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