if one knows what's good for one

if (one) knows what's good for (one)

If one wants to avoid trouble. Oh, you'll be on-time for the meeting, if you know what's good for you.
See also: good, if, know

if one knows what's good for one

Fig. 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.
See also: good, if, know, one
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