let well alone

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let well alone

To refrain from changing, disturbing, or becoming involved in something so as to avoid unintentionally causing (or worsening) problems. To be honest, you're better off letting well alone at this point. She's so angry that anything you say will just make things worse. Messing with the registry can cause catastrophic problems for your computer. If it isn't already totally busted, I would let well alone.
See also: alone, let, well

leave/let well aˈlone

(British English) (American English let well enough aˈlone) not try to change something or get involved in something: Arguments between other couples should be let well alone.
See also: alone, leave, let, well