overfly vs overstep

overfly

verb
  • To fly too far past something. 

  • To fly over something. 

overstep

verb
  • To go too far beyond (a limit); especially, to cross boundaries or exceed norms or conventions. 

  • To take a step in which the foot touches ground too far forward. 

  • To move with a gait such that the hind foot touches the ground forward of the point where the front foot touches the ground. 

noun
  • A gait in which the hind foot touches ground in front of where the front foot touches the ground. 

  • A movement in which one oversteps. 

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