countenance vs get behind

countenance

verb
  • To tolerate, support, sanction, patronise or approve of something. 

noun
  • Appearance, especially the features and expression of the face. 

  • Favour; support; encouragement. 

  • Calm facial expression, composure, self-control. 

get behind

verb
  • To appreciate, to enjoy. 

  • To support, to cheer on. 

  • To have a trip or any pleasurable experience with drugs. 

  • To come to believe something; to change one's mind into a new position. 

  • Used other than figuratively or idiomatically: see get, behind. 

How often have the words countenance and get behind occurred in a corpus of books? (source: Google Ngram Viewer )