relent vs tenderize

relent

verb
  • To slacken; to abate. 

  • To give in or be swayed; to become less hard, harsh, or cruel; to show clemency. 

noun
  • Stay; stop; delay. 

tenderize

verb
  • To make (something, especially meat) tender. 

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