run over vs step on

run over

verb
  • To describe briefly; to summarize or recapitulate. 

  • To have rotation in such direction that the crank pin traverses the upper, or front, half of its path in the forward, or outward, stroke; said of a crank which drives, or is driven by, a reciprocating piece. 

  • To cross by running. 

  • To overflow. 

  • To exceed the allotted time. 

  • To drive over, causing injury or death. 

  • To score a try. 

  • To rehearse quickly. 

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 run over and step on occurred in a corpus of books? (source: Google Ngram Viewer )