cumshaw vs relinquish

cumshaw

verb
  • To give or make a present to. 

noun
  • A gratuity or tip as thanks for a service 

relinquish

verb
  • To metaphorically surrender, yield control or possession. 

  • To give up, abandon or retire from something. To trade away. 

  • To let go (free, away), physically release. 

  • To accept to give up, withdraw etc. 

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