leave well alone
US /liːv wɛl əˈloʊn/
UK /liːv wɛl əˈloʊn/

1.
biarkan sahaja, jangan diusik
to not try to change something that is already satisfactory or working well, because doing so might make it worse
:
•
The system is working fine, so it's best to leave well alone.
Sistem berfungsi dengan baik, jadi lebih baik biarkan sahaja.
•
I was going to redecorate, but my husband told me to leave well alone.
Saya hendak menghias semula, tetapi suami saya menyuruh saya biarkan sahaja.