let sleeping dogs lie
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

[TahlilGaran] Dictionary of Contemporary English ▲

let sleeping dogs lie
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.
His parents never referred to the shoplifting incident again. I suppose they thought it best to let sleeping dogs lie.

It wasn't that we didn't want to improve the school - it was more a case of letting sleeping dogs lie.

[TahlilGaran] English Idioms Dictionary ▲

let sleeping dogs lie
don't make trouble if you don't have to
"You should let sleeping dogs lie and not worry about what your friend said to you last summer."

You should let sleeping dogs lie and not ask our boss any questions about the dispute.

"You should let sleeping dogs lie and not ask your friend for the money that he owes you."

[TahlilGaran] English Idioms Dictionary ▲

let sleeping dogs lie
Do not make (someone) angry and cause trouble or danger; do not make trouble if you do not have to.
■ A proverb.
Don't tell Father that you broke the window. Let sleeping dogs lie.

[TahlilGaran] English Idioms Dictionary ▲