pull back vs step off

pull back

verb
  • Used other than figuratively or idiomatically: see pull, back. 

  • To retreat. 

  • To pass (the ball) into a position further from the attacking goal line. 

  • To score when the team is losing. 

step off

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

  • To avoid a conflict; to back down 

  • To measure by steps or paces; hence, to divide (a space), or to form a series of marks, by successive measurements, as with dividers. 

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