black art
noun
Definitions
A practice such as witchcraft, sorcery, necromancy, or black magic.
(by extension) A process that is mysterious or difficult to master.
Example: Operating a hand card punch was something of a black art.
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Definitions
A practice such as witchcraft, sorcery, necromancy, or black magic.
(by extension) A process that is mysterious or difficult to master.
Example: Operating a hand card punch was something of a black art.