hang on vs hold on

hang on

verb
  • To keep; to store something for someone. 

  • To hold, grasp, or grip. 

  • To pay close attention to, or regard with (possibly obsequious) admiration. 

  • To depend upon. 

  • To continually believe in something; to have faith in. 

  • To wait a moment. 

  • To persevere. 

hold on

verb
  • To keep; to store something for someone. 

  • To remain loyal. 

  • To grasp or grip firmly. 

  • To persist. 

  • Wait a short while. 

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