beat down vs kick someone's ass

beat down

verb
  • To severely beat someone up. 

  • (of rain) To strike with great force. 

  • (of the sun) To shine brightly and radiate with intense heat. 

  • Used other than figuratively or idiomatically: see beat, down. 

  • To wear (someone) out by repeated actions that overwhelm one's patience or strength. 

  • To forcefully diminish the power or influence of; to quell; to squash. 

  • To haggle with (someone) to sell at a lower price. 

kick someone's ass

verb
  • To clobber someone; to beat someone severely. 

  • To actually kick someone in the buttocks. 

How often have the words beat down and kick someone's ass occurred in a corpus of books? (source: Google Ngram Viewer )