blur vs brighten

blur

verb
  • To make indistinct or hazy, to obscure or dim. 

  • To cause imperfection of vision in; to dim; to darken. 

  • To become indistinct. 

  • To transfer the input focus away from. 

  • To smear, stain or smudge. 

noun
  • Something that appears hazy or indistinct 

  • A smear, smudge or blot 

adj
  • In a state of doubt or confusion. 

brighten

verb
  • To grow bright, or more bright in color; to clear up 

  • To make illustrious, or more distinguished; to add luster or splendor to 

  • To make more cheerful and pleasant; to enliven 

  • To make bright or brighter in color. 

  • To become brighter or more cheerful in mood 

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