pass on vs spin down

pass on

verb
  • To skip or decline. 

  • To convey or communicate. 

  • To go forward. 

  • To die. 

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

spin down

verb
  • To diminish in energy; to slow down or peter out; to be gradually canceled or ended. 

  • To reduce its speed of rotation. 

  • To reduce its spinning speed from that required for reading and writing. 

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