backtracking vs overtake

backtracking

noun
  • The act of one who, or that which, backtracks; a retracing of one's steps. 

  • The usage of a runway as a taxiway, especially at private strips and smaller airports. 

  • The act of building all possible solutions to a problem incrementally, abandoning any candidate solution if it cannot lead to a valid solution. 

overtake

noun
  • An act of overtaking; an overtaking maneuver. 

verb
  • To become greater than something else 

  • To occur unexpectedly; take by surprise; surprise and overcome; carry away 

  • To pass a slower moving object or entity (on the side closest to oncoming traffic). 

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