Let sleeping dogs lie

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"Let sleeping dogs lie" is an English proverb known at least since the 14th century. This saying suggests that when an old problem is no longer causing anyone trouble, it might be better left undiscussed: "Possibly he cohabited with Miss Bloggs, but don't mention it in front of his wife, let the sleeping dogs lie", and dormant controversies should not be restarted even if they were never resolved. This intent is similar to the meanings of sayings like "Don't rock the boat", "Never trouble trouble till trouble troubles you".

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