hortative vs red flag

hortative

noun
  • A mood or class of imperative subjunctive moods of a verb for giving strong encouragement. 

adj
  • Of a mood or class of imperative subjunctive moods of a verb for giving strong encouragement. 

  • Urging, exhorting, or encouraging. 

red flag

noun
  • A cue, warning, or alert; a sign or signal that something is wrong. 

  • A signal that the race must be stopped immediately (and possibly restarted). 

  • red rag 

  • A common symbol, usually in the form of a banner, for leftist revolutionary ideologies, especially socialism. 

  • In the United Kingdom and some other countries, a flag formerly used by a railway guard to warn the driver not to start the train. 

How often have the words hortative and red flag occurred in a corpus of books? (source: Google Ngram Viewer )