aggravating circumstance vs kick in the teeth

aggravating circumstance

noun
  • A factor that increases the culpability or deleterious consequences of a wrongful act. 

kick in the teeth

noun
  • A humiliating insult or instance of bad treatment, especially when one is expecting friendship or in need of support; a sudden and unexpected setback; a strong rebuff. 

How often have the words aggravating circumstance and kick in the teeth occurred in a corpus of books? (source: Google Ngram Viewer )