Being bothered or upset by something; paying attention to something; or taking care of or watching over someone or something.
From Old English 'gemynd' (memory, remembrance), the word 'mind' originally meant 'to remember,' then evolved to mean 'to think about' and 'to be concerned with.'
The phrase 'never mind' literally means 'don't think about it,' but saying it is actually a clever way to end an argument by refusing to explain yourself—historians think this phrase became popular as a polite way to shut down discussions!
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