cool off vs subside

cool off

verb
  • To decrease in temperature, activity, or temper. 

  • To cause to decrease in temperature, activity or temper. 

subside

verb
  • To fall downward; to become lower; to descend; to sink. 

  • To cease talking. 

  • To sink or fall to the bottom; to settle, as lees. 

  • To fall into a state of calm; to be calm again; to settle down; to become tranquil; to abate. 

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