repine vs sob

repine

verb
  • To complain; to regret. 

  • To fail; to wane. 

sob

verb
  • To say (something) while sobbing. 

  • To soak. 

  • To weep with convulsive gasps. 

noun
  • A cry with a short, sudden expulsion of breath. 

  • sound of sob 

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