lessen vs shrivel

lessen

verb
  • To make less; to diminish; to reduce. 

  • To become less. 

conj
  • unless. 

shrivel

verb
  • To collapse inward; to crumble. 

  • To become wrinkled. 

  • To draw into wrinkles. 

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