jigging vs skipping

jigging

noun
  • The act of dancing a jig. 

  • 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. 

skipping

noun
  • The game, activity, or exercise of jump rope. 

  • The act by which something is skipped or omitted. 

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