descending vs jigging

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. 

jigging

noun
  • The act of using a jig; the act of separating ore with a jigger, or wire-bottomed sieve, which is moved up and down in water. 

  • The act of dancing a jig. 

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