pull back vs shrink (back)

pull back

verb
  • To retreat. 

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

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

  • To score when the team is losing. 

shrink (back)

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