duke it out vs fistfight

duke it out

verb

  • To fight, especially with the fists. 

  • To argue heavily or at length. 

fistfight

verb

  • To fight using bare fists. 

noun

  • A fight using bare fists. 

How often have the words duke it out and fistfight occurred in a corpus of books? (source: Google Ngram Viewer )