blow down vs subvert

blow down

verb
  • Synonym of dirty down 

  • To knock over with an air current, most often wind. 

subvert

verb
  • To pervert, as the mind, and turn it from the truth; to corrupt; to confound. 

  • To upturn convention from the foundation by undermining it (literally, to turn from beneath). 

  • To overturn from the foundation; to overthrow; to ruin utterly. 

noun
  • An advertisement created by subvertising. 

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