go over vs walk back

go over

verb
  • Used other than figuratively or idiomatically: see go, over. 

  • To create a response or impression. 

  • To look at carefully; to scrutinize; to analyze. 

  • To score a try. 

walk back

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

  • To withdraw or backpedal on a statement or promise. 

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