black art vs jinx

black art

noun
  • A process that is mysterious or difficult to master. 

  • A practice such as witchcraft, sorcery, necromancy, or black magic. 

jinx

noun
  • A person or thing supposed to bring bad luck. 

  • A hex; an evil spell. 

intj
  • Used after the same thing is said by two people simultaneously. 

verb
  • To cast a spell on. 

  • To bring bad luck to. 

  • To cause something to happen by mentioning it, usually sarcastically. 

How often have the words black art and jinx occurred in a corpus of books? (source: Google Ngram Viewer )