cross swords vs duke it out

cross swords

verb
  • To fight with someone; to duel. 

  • Used other than figuratively or idiomatically: see cross, sword., to place or hold two swords so they cross each other. 

  • For males, to urinate simultaneously such that the streams intersect. 

  • To quarrel or argue with someone; to have a dispute with someone. 

duke it out

verb
  • To fight, especially with the fists. 

  • To argue heavily or at length. 

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