bust a cap vs kick in

bust a cap

verb
  • To fire a weapon; to shoot with a gun. 

kick in

verb
  • To kick or strike (a person); to beat up 

  • To kick or strike so as to cause the object struck to collapse or fall inwards. 

  • To start, connect, or take effect, especially in a sudden way. 

  • To contribute, especially to a collection of money. 

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