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a necessary evil
->Meaning: If you say something is a necessary evil, you don’t like it but you understand that it has to be accepted sometimes or it has to exist.
->Sandra says money’s a necessary evil. She thinks it causes many problems, but she can’t imagine how the world could work without it.
->My brother regards exercise as a necessary evil. He hates doing it, but he knows he has to do it if he wants to stay healthy.