You'd better be on time if you know what's good for you.
•If you know what's good for you, you'll call and apologize.
Dictionary of American idioms. 2013.
if one knows what’s good for one — phr. one had better do what is expected of one. □ You’d better be on time if you know what’s good for you. □ If you know what’s good for you, you’ll call and apologize … Dictionary of American slang and colloquial expressions
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