The idiom "not lose sleep over someone or something" means that one is not excessively worried or concerned about a particular person or situation. It implies that one can remain calm and undisturbed, even in the face of potential problems or stressors. The phrase suggests that the matter at hand is not significant enough to keep one awake at night. This expression is often used to convey a sense of emotional detachment or resilience.

What is the origin of the idiom "not lose sleep over someone or something" and when to use it?

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to {not} [lose] (any|) sleep (over|about) {sb/sth}

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Definition und Bedeutung von „not lose (any) sleep over somebody or something “ im Englischen

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