brush off vs encourage

brush off

verb
  • Used other than figuratively or idiomatically: see brush, off. To remove something with a brush. 

  • To disregard (something), to dismiss or ignore (someone), as unimportant. 

encourage

verb
  • To mentally support; to motivate, give courage, hope or spirit. 

  • To spur on, strongly recommend. 

  • To foster, give help or patronage 

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