cap it all off vs kick someone when they are down

cap it all off

verb
  • To surpass or outdo something. 

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

kick someone when they are down

verb
  • To make things worse for someone who is going through a difficult time. 

How often have the words cap it all off and kick someone when they are down occurred in a corpus of books? (source: Google Ngram Viewer )