gird vs knock on wood

gird

verb
  • To prepare (oneself) for an action. 

  • To jeer at. 

  • To bind with a flexible rope or cord. 

  • To encircle with, or as if with a belt. 

  • To jeer. 

noun
  • A sarcastic remark. 

  • A stroke with a rod or switch. 

  • A severe spasm; a twinge; a pang. 

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 gird and knock on wood occurred in a corpus of books? (source: Google Ngram Viewer )