Idiom – Let sleeping dogs lie

• Idiom – Let sleeping dogs lie.
• Meaning –  This idiomatic expression means you should leave something alone if it might cause trouble. This idiom advises you to leave inactive problems alone.
• This idiom is commonly given as advice to someone who may be about to instigate some kind of trouble or cause a problem.
• The words in this idiom – let sleeping dogs lie – let the listener imagine there is a ferocious or scary dog sleeping. They are being advised not to wake this dangerous dog!

Example:

• “Don’t ask him about his divorce. It’s best to let sleeping dogs lie!”

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