stand down vs validate

stand down

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

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

validate

verb
  • To check or prove the validity of; verify. 

  • To have its validity successfully proven. 

  • To render valid. 

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