intend vs knock on wood

intend

verb
  • To fix the mind upon (something, or something to be accomplished); be intent upon 

  • To apply with energy. 

  • To design mechanically or artistically; fashion; mold. 

  • To bend or turn; direct, as one’s course or journey. 

  • To fix the mind on; attend to; take care of; superintend; regard. 

  • To strain; make tense. 

  • To pretend; counterfeit; simulate. 

knock on wood

verb
  • To take a customary action to ward off some misfortune that is believed to be attracted by a presumptuous statement. 

intj
  • Hopefully; a self-directive to undertake the customary action to ward off bad luck. 

How often have the words intend and knock on wood occurred in a corpus of books? (source: Google Ngram Viewer )