dismantle vs knock off

dismantle

verb
  • To remove fittings or furnishings from. 

  • To divest, strip of dress or covering. 

  • To take apart; to disassemble; to take to pieces. 

knock off

verb
  • To remove, as a discount or estimate. 

  • To rob. 

  • To defeat. 

  • To halt one's work or other activity. 

  • To have sex with. 

  • 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. 

  • To accomplish hastily. 

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