cool down vs quick-freeze

cool down

verb
  • To cause (something) to become cooler; to reduce the temperature of. 

  • To become cooler; to be reduced in temperature. 

  • To become less agitated or excited. 

  • To decrease in degree or intensity. 

  • To cause (someone) to become less agitated or excited. 

quick-freeze

verb
  • To rapidly reduce the temperature of something to below the freezing point, thereby preserving some aspect of it (such as position or flavor) that would otherwise be lost during the freezing process. 

  • Preserved in an unaltered state, reminiscent of quick-freezing. 

noun
  • A chamber or device in which the temperature may be rapidly lowered to below to freezing point. 

How often have the words cool down and quick-freeze occurred in a corpus of books? (source: Google Ngram Viewer )