pull back vs secede

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. 

secede

verb
  • To split from or to withdraw from membership of a political union, an alliance or an organisation. 

  • To split or to withdraw one or more constituent entities from membership of a political union, an alliance or an organisation. 

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