comshaw vs cumshaw

comshaw

noun
  • A bribe or gratuity for a service or for arranging a deal; squeeze. 

  • The practice of pilfering or bartering for surplus items. 

verb
  • To acquire without officially requisitioning; to pilfer or barter for surplus items. 

cumshaw

noun
  • A gratuity or tip as thanks for a service 

verb
  • To give or make a present to. 

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