Definition of a necessary evil in English:

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a necessary evil

Something that is undesirable but must be accepted: for many, paying taxes is at best a necessary evil
More example sentences
  • In fact they enter the course regarding cryptography as a necessary evil that must be endured in order for them to obtain an Information Security qualification.
  • If this was making inroads into the problem then many Americans would reluctantly accept this as a necessary evil.
  • But if lights are occasionally necessary, they are a necessary evil.
See parent entry: necessary
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