step on vs violate

step on

verb
  • Used other than figuratively or idiomatically: see step, on. 

  • to adulterate a drug for the purpose of increasing its bulk, and therefore its profit; to dilute, cut. 

violate

verb
  • To break or disregard (a rule or convention). 

  • To cite (a person) for a parole violation. 

  • To rape. 

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