Let sleeping dogs lie

Meaning

Do not disturb a situation that is currently calm, even if there is a conflict beneath the surface.

Usage

Advises people to avoid reigniting old arguments.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Rooted in the idea that awakening a sleeping dog might stir trouble.

Recorded in 16th-century English proverbs; still used in advice columns and mediations.