stand down vs walk out

stand down

verb
  • To wait; to stop pursuing, stop fighting, or relax from a heightened readiness posture. 

  • To withdraw or retire from a position or from a team. 

walk out

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

  • 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 leave suddenly, especially as a form of protest. 

  • To stage a walkout or strike. 

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

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