Wiktionary
phr. To leave something alone; to avoid attempts to correct, fix, or improve what is already sufficient
Usage examples of "leave well enough alone".
If I wanted pressure on her belly, I would tell him-otherwise leave well enough alone.
If the legend's better than the truth I'd probably be well advised to leave well enough alone.
There came a time when the best thing to do was leave well enough alone and—.
You admire me for what I am, not for what I look like, so let us leave well enough alone.
And he was an anxious impatient artist who couldn't leave well enough alone, who had to add those clever little touches.
If I have sense enough to leave well enough alone, sooner or later I will retire on a pension and Social Security and spend the rest of my life fishing contented and lying about what a great guy I used to be.
If I have sense enough to leave well enough alone, sooner or later I will retire on a pension an' Social Security an' spend the rest of my life fishin' contented an' lyin' about what a great guy I used to be.
Poked his nose into something that was none of his affair because he simply couldn't leave well enough alone, and now look what he'd landed himself in!