walk off vs walk out

walk off

verb
  • To flee or abandon. 

  • To measure a distance by walking, as by counting paces or extending a measuring tape or rope. 

  • To recover from (a minor injury) or digest (a large meal) by walking around. 

walk out

verb
  • To leave suddenly, especially as a form of protest. 

  • To step away with when carrying the weight in order not to hit the rack it was lifted off from during execution of the exercise. 

  • To stage a walkout or strike. 

  • To continue or persist in carrying (something) out or following through (with something); to persevere. 

  • To accompany (someone) as they leave a house or other building. 

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