knock off vs rehearse

knock off

verb
  • To accomplish hastily. 

  • To rob. 

  • To defeat. 

  • To halt one's work or other activity. 

  • To have sex with. 

  • To remove, as a discount or estimate. 

  • To make a copy of, as of a design. 

  • To assign (an item) to a bidder at an auction, indicated by knocking on the counter. 

  • To remove by hitting (something, someone) 

  • To kill. 

rehearse

verb
  • To contrive and carefully prepare (a story, etc.) to offer consistency. 

  • To narrate; to relate; to tell. 

  • To repeat, as what has been already said; to tell over again; to recite. 

  • To practise by recitation or repetition in private for experiment and improvement, prior to a public representation, especially in theater 

  • To cause to rehearse; to instruct by rehearsal. 

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