busk vs move ahead

busk

verb
  • To tack, cruise about. 

  • To solicit money by entertaining the public in the street or in public transport. 

noun
  • A strip of metal, whalebone, wood, or other material, worn in the front of a corset to stiffen it. 

  • A corset. 

move ahead

verb
  • to go on to something else 

  • to proceed; to make or signify progress 

  • to continue without being distracted; to keep going 

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