a necessary evil
This page is about the idiom a necessary evil
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.
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Contributor: Matt Errey