brush off vs omit

brush off

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

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

omit

verb
  • To neglect or take no notice of. 

  • To delete or remove; to strike. 

  • To leave out or exclude. 

  • To fail to perform. 

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