draw blood vs mar

draw blood

verb
  • To have an injurious effect; to strike home, as a barb or insult. 

  • To wound one's opponent in such a way that they bleed. 

mar

verb
  • To spoil; to ruin; to scathe; to damage. 

noun
  • A small lake. 

  • A blemish. 

How often have the words draw blood and mar occurred in a corpus of books? (source: Google Ngram Viewer )