fade away vs spin down

fade away

verb
  • To lose strength, become weaker; to wane; to disappear or reduce slowly. 

noun
  • A technique of painting young women, by having their clothes fade into the background. 

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 fade away and spin down occurred in a corpus of books? (source: Google Ngram Viewer )