pass on vs swap out

pass on

verb
  • To transfer (something) to someone, especially by handing or bequeathing it to the next person in a series. 

  • To convey or communicate. 

  • To go forward. 

  • To die. 

  • To skip or decline. 

swap out

verb
  • To exchange (something or someone) for an unused (or less-used) equivalent. 

  • To exchange (something) for (something else). (usually followed by with or for) 

  • To transfer (memory contents) into a swap file. 

noun
  • Anything that is swapped out for another; an exchange. 

  • A pre-prepared food item used in place of an unfinished food item in order to cut down the overall preparation time during filming. 

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