evaporate vs sharpen

evaporate

verb
  • to expel moisture from (usually by means of artificial heat), leaving the solid portion 

  • to give vent to; to dissipate 

  • to transition from a liquid state into a gaseous state 

  • to disappear; to escape or pass off without effect 

sharpen

verb
  • To make sharp. 

  • To become sharp. 

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