cap it all off vs twist the knife

cap it all off

verb
  • To finish or complete something; to add a finishing touch. 

  • To surpass or outdo something. 

twist the knife

verb
  • To deliberately do or say something to worsen a difficult situation or increase a person's distress, irritation, or anger. 

How often have the words cap it all off and twist the knife occurred in a corpus of books? (source: Google Ngram Viewer )