leave well enough alone
US /liːv wɛl ɪˈnʌf əˈloʊn/
UK /liːv wɛl ɪˈnʌf əˈloʊn/
1.
to allow a situation to remain as it is, because trying to improve it might make things worse
:
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The old system works fine, so let's leave well enough alone.
•
I wanted to offer advice, but decided to leave well enough alone.