pull out vs split off

pull out

verb
  • To withdraw; especially of military forces; to retreat. 

  • To maneuver a vehicle from the side of a road onto the lane. 

  • To draw out or lengthen. 

  • To use coitus interruptus as a method of birth control. 

  • To remove something from a container. 

  • To transition from a dive to level or climbing flight. 

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

split off

verb
  • To break away from a group or mass. 

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