fabricate vs knock down

fabricate

verb
  • To invent and form; to forge; to devise falsely. 

  • To form by art and labor; to manufacture; to produce. 

  • To form into a whole by uniting its parts; to construct; to build. 

  • To cut up an animal as preparation for cooking, particularly used in reference to fowl. 

knock down

verb
  • To hit or knock (something or someone), intentionally or accidentally, so that it falls. 

  • To drink fast. 

  • To disassemble for shipment. 

  • To reduce the price of. 

  • To demolish. 

  • To approve a drinking toast by banging glasses on the table. 

  • At an auction, to declare (something) sold with a blow from the gavel. 

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