move back vs walk back

move back

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

  • To reschedule (something) to a later date or time. 

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 move back and walk back occurred in a corpus of books? (source: Google Ngram Viewer )