sit-down vs vigil

sit-down

noun
  • A sit-in, a protest of civil disobedience by people sitting and refusing to move. 

  • An act of sitting down, especially with other people in some form of social exchange. 

adj
  • Intended to be done, used, consumed etc. while sitting. 

vigil

noun
  • A quiet demonstration in support of a cause. 

  • A period of observation or surveillance at any hour. 

  • An instance of keeping awake during normal sleeping hours, especially to keep watch or pray. 

  • The eve of a religious festival in which staying awake is part of the ritual devotions. 

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