Meaning
To deliberately avoid restarting a conflict, discussion, or problem that has already been settled, especially when raising it again could cause more harm than good.
It’s typically offered as cautionary advice, warning that revisiting old grievances rarely improves the situation and often makes it worse.
Origin
The underlying image is ancient, but the specific wording took centuries to settle into its modern form, and the claim of an exact 1374 Chaucer quotation overstates the connection. In “Troilus and Criseyde” (usually dated around 1380, not 1374), Chaucer wrote “It is nought good a slepyng hound to wake” — a related proverb about waking a sleeping hound, but using different wording and a singular dog rather than “sleeping dogs lie.” The proverb had clearly become common currency by 1546, when John Heywood included a version of it in his influential collection of English proverbs. The specific phrase “let sleeping dogs lie,” in close to its current wording, doesn’t appear reliably in print until much later: an 1822 short story in “The London Magazine” has a character remark, after finding a dead hound, “Let sleeping dogs lie… when he saw the dead hound before him” — evidence that even in the 19th century writers still felt free to play with the proverb’s imagery rather than treating it as fixed. The saying likely reflects a simple, universal piece of practical wisdom about actual dogs — that waking an aggressive or startled animal is more dangerous than leaving it be — which was extended metaphorically to disputes and old grievances long before any single author “coined” it.
Examples
Their divorce was finalized years ago — I think it’s best to let sleeping dogs lie and not bring up who was at fault.
The committee decided to let sleeping dogs lie rather than reopen the investigation from a decade ago.
My grandmother always told us to let sleeping dogs lie when it came to old family arguments.
A: Should I ask him about what happened at the wedding? B: No, just let sleeping dogs lie.
Frequently asked questions
What does 'Let sleeping dogs lie' mean?
To deliberately avoid restarting a conflict, discussion, or problem that has already been settled, especially when raising it again could cause more harm than good.
It’s typically offered as cautionary advice, warning that revisiting old grievances rarely improves the situation and often makes it worse.