black magic

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black magic (uncountable)

1. (idiomatic) Magic derived from evil forces, as distinct from good or benign forces; or magic performed with the intention of doing harm.

   Synonym: dark magic

When referring to advanced technology, calling something (plain) magic means that it is not understood, but implies that it can be by those versed in the field. Black magic, on the other hand, implies that few understand it.

• gray magic
• white magic

• black magician