drop off vs hand off

drop off

verb
  • To deliver; to deposit or leave; to allow passengers to alight. 

  • To fall. 

  • To lessen or reduce. 

  • To fall asleep. 

hand off

verb
  • to pass or transfer. 

  • to pass (the ball) to a teammate 

How often have the words drop off and hand off occurred in a corpus of books? (source: Google Ngram Viewer )