blow down vs cast down

blow down

verb
  • Synonym of dirty down 

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

cast down

verb
  • Used other than figuratively or idiomatically: see cast, down. 

  • To overthrow, to defeat or bring to ruin. 

  • To make (a person) discouraged or dejected. 

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