guillotine vs knock off

guillotine

verb
  • To execute (someone) with a guillotine. 

  • To end (a legislative debate) by invoking cloture. 

  • To cut or trim (a body part, a stack of paper, etc.) with a guillotine. 

  • To end discussion (about a parliamentary bill or part of one) by invoking a guillotine procedure. 

noun
  • A device used for cutting the pages of books, stacks of paper, etc., to straight edges, usually by means of a hinged or sliding blade attached to a flat platform. 

  • A legislative motion that debate be ended and a vote taken; a cloture. 

  • A parliamentary procedure for fixing the dates when various stages of discussion of a bill must end, to ensure that the enactment of the bill proceeds expeditiously. 

  • An instrument with a sliding blade for cutting the tonsils, uvula, or other body parts. 

  • A machine used for the application of capital punishment by decapitation, consisting of a tall upright frame from which is suspended a heavy diagonal-edged blade which is dropped onto the neck of the person to be executed; also, execution using this machine. 

knock off

verb
  • To remove by hitting (something, someone) 

  • 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 kill. 

  • To accomplish hastily. 

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