do it vs overstep the mark

do it

verb
  • To do something exceptionally foolish or unacceptable. 

  • To urinate. 

  • To be appealing or suitable. 

  • Used other than figuratively or idiomatically: see do, it. 

  • To have sex; make it. 

overstep the mark

verb
  • To behave in an unacceptable or morally reprehensible way. 

How often have the words do it and overstep the mark occurred in a corpus of books? (source: Google Ngram Viewer )