beat the pants off vs drub

beat the pants off

verb
  • To thoroughly and decisively defeat someone, either in a physical fight or, figuratively, in a competition. 

drub

verb
  • To defeat someone soundly; to annihilate or crush. 

  • To beat (someone or something) with a stick. 

  • To forcefully teach something. 

  • To criticize harshly; to excoriate. 

noun
  • Carbonaceous shale; small coal; slate, dross, or rubbish in coal. 

How often have the words beat the pants off and drub occurred in a corpus of books? (source: Google Ngram Viewer )