boil something down vs compress

boil something down

compress

verb
  • To abridge. 

  • To make digital information smaller by encoding it using fewer bits. 

  • To be pressed together or folded by compression into a more economic, easier format. 

  • To make smaller; to press or squeeze together, or to make something occupy a smaller space or volume. 

  • To condense into a more economic, easier format. 

noun
  • A multiply folded piece of cloth, a pouch of ice etc., used to apply to a patient's skin, cover the dressing of wounds, and placed with the aid of a bandage to apply pressure on an injury. 

  • A machine for compressing. 

How often have the words boil something down and compress occurred in a corpus of books? (source: Google Ngram Viewer )