lessen vs widen

lessen

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

  • To become less. 

conj
  • unless. 

widen

verb
  • To let out clothes to a larger size. 

  • To make wide or wider. 

  • To convert to a data type that can hold a larger number of distinct values. 

  • To broaden or extend in scope or range. 

  • To become wide or wider. 

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