cumshaw vs string to one's bow

cumshaw

noun

  • A gratuity or tip as thanks for a service 

verb

  • To give or make a present to. 

string to one's bow

noun

  • A skill, ability or resource. 

  • A lover, paramour or suitor. 

How often have the words cumshaw and string to one's bow occurred in a corpus of books? (source: Google Ngram Viewer )