go down vs step on

go down

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

  • To crash. 

  • To be soundly defeated. 

  • To be received or accepted. 

  • To be pleasant, etc., when eaten or drunk. 

  • To perform oral sex. 

  • To decrease; to change from a greater value to a lesser one. 

  • To fall (down); to fall to the floor. 

  • To take place, happen. 

  • To sink. 

  • To be blamed for something; to be the scapegoat; to go to prison. 

  • To stop functioning, to go offline. 

  • To be recorded or remembered (as). 

  • Synonym of set, to disappear below the horizon. 

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. 

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