let sleeping dogs lie 

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.

let sleeping dogs lie by International Bad Boy November 20, 2004

Let sleeping dogs lie 

avoid interfering in a situation that is currently causing no problems but might do so as a result of such interference.

"It's best to let sleeping dogs lie and not bring up old arguments that could cause unnecessary tension in the group."

Let sleeping dogs lie by Arminkshipper May 20, 2025

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.

Let sleeping dogs lie. by aCh79 August 3, 2011