blur vs burn off

blur

verb
  • To smear, stain or smudge. 

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

  • To become indistinct. 

  • To transfer the input focus away from. 

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

adj
  • In a state of doubt or confusion. 

noun
  • Something that appears hazy or indistinct 

  • A smear, smudge or blot 

burn off

verb
  • Cause to waste energy. 

  • To dispose of (unusable explosive natural gas from an oil well) by burning it as it emerges from the well. 

  • To dissipate as the result of heat. 

  • To fill (low-value air time) with programming not suitable for its original purpose. 

  • To cause to dissipate by applying heat. 

  • To fail due to overheating. 

  • To expend energy resulting from metabolizing food. 

  • To use up a resource in a nonproductive manner. 

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