brickbat vs parting shot

brickbat

noun
  • A criticism or uncomplimentary remark. 

  • A piece of brick used as a weapon, especially if thrown, or placed in something like a sock and used as a club. 

verb
  • To assail with criticism. 

  • To attack by throwing brickbats. 

parting shot

noun
  • An insult or barbed comment issued as the speaker departs or the conversation comes to an end. 

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