busk vs shirk

busk

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

  • To tack, cruise about. 

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

  • A corset. 

shirk

verb
  • To procure by petty fraud and trickery; to obtain by mean solicitation. 

  • To avoid, especially a duty, responsibility, etc.; to stay away from. 

  • To evade an obligation; to avoid the performance of duty, as by running away. 

noun
  • One who shirks, who avoids a duty or responsibility. 

  • The unforgivable sin of idolatry. 

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