cumshaw vs pay off

cumshaw

verb
  • To give or make a present to. 

noun
  • A gratuity or tip as thanks for a service 

pay off

verb
  • To pay back; to repay. 

  • To bribe, especially to deter oversight. 

  • To pay back (repay, pay off) the entirety of a loan, thereby effecting the release of a lien on. 

  • To fall to leeward, as the head of a vessel under sail. 

  • To become worthwhile; to produce a net benefit. 

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