descending vs tailspin

descending

noun
  • A descent. 

adj
  • Ordered such that each element is less than or equal to the previous element. 

  • Moving or sloping downwards. 

  • Becoming lower in pitch. 

  • Causing a sequence to follow a descending order. 

tailspin

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

  • A severe mental or emotional collapse; emotional breakdown. 

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

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. 

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