hand over vs hold on

hand over

verb
  • To relinquish control or possession of something to someone. 

  • To deliver (someone to an enemy, police, etc.). 

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 hand over and hold on occurred in a corpus of books? (source: Google Ngram Viewer )