it means "don't bring up an old subject or trouble."
1: What about that time when I shagged his girl?
2: Dude, let those sleeping dogs lie.
1: Oops, gotcha.
by International Bad Boy November 20, 2004

5 Words Related to let sleeping dogs lie

-Prov: Don't be a trouble maker ,let the fuck alone it's gunna beget trouble.
-To not talk about things which have caused problems in the past, or to not try to change a situation because you might cause problems.
Jill: Should I ask the boss if he's upset at my coming in late in the mornings?
Jane: If he hasn't said anything about it, just let sleeping dogs lie. I thought I would ask Jill if she wanted me to pay her back right away, but then I decided to let sleeping dogs lie.
by aCh79 August 03, 2011

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