antistrophe vs understatement

antistrophe

noun
  • The retort or turning of an adversary's plea against him. 

  • The lines of this part of the choral song. 

  • The repetition of a word or phrase at the end of successive clauses 

  • In Greek choruses and dances, the returning of the chorus, exactly answering to a previous strophe or movement from right to left. 

  • The repetition of words in an inverse order. 

understatement

noun
  • An instance of such phrasing or lack of emphasis. 

  • A figure of speech whereby something is made to seem smaller or less important than it actually is, either through phrasing or lack of emphasis, often for ironic effect. 

  • An incomplete disclosure that intentionally withholds relevant information. 

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