Its best to leave a situation as it is if disturbing it might cause trouble
Avoid restarting an old conflict.
To leave things as they are in order to avoid problems
As Mary was in good spirits that morning, I decided not to bring up the argument that we had last night. It was best to let sleeping dogs lie.
I knew he was stealing from me but, he is proud and he really needs the money. I preferred to let sleeping dogs lie and to say nothing.e.
I wanted to tell him what I thought, but then I decided it will be better to let sleeping dogs lie.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.