increase vs tailspin

increase

noun
  • The creation of one or more new stitches; see Increase (knitting). 

  • For a quantity, the act or process of becoming larger 

  • Offspring, progeny 

  • An amount by which a quantity is increased. 

verb
  • To multiply by the production of young; to be fertile, fruitful, or prolific. 

  • To become more nearly full; to show more of the surface; to wax. 

  • To make (a quantity, etc.) larger. 

  • (of a quantity, etc.) To become larger or greater. 

tailspin

verb
  • Of an aircraft: to go into a rapid, uncontrollable descent in a steep spiral. 

  • To go into a sharp, sustained, often uncontrollable descent or decline. 

noun
  • A severe mental or emotional collapse; emotional breakdown. 

  • Any sharp, sustained, often uncontrollable descent or decline. 

  • The rapid, uncontrollable descent of an aircraft in a steep spiral. 

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