engrossing vs off the chain

engrossing

noun
  • The act of one who engrosses, or buys up wholesale. 

adj
  • Utterly consuming one's time and attention. 

off the chain

prep
  • Free from work or direct supervision. 

  • Crazy and exciting; delirious and wild. 

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