come for vs drop off

come for

verb
  • Used other than figuratively or idiomatically: see come, for. 

  • To search for someone with the intent to apprehend or cause harm. 

  • To target someone for competition or attack. 

drop off

verb
  • To fall. 

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

  • To lessen or reduce. 

  • To fall asleep. 

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