abend vs knock down

abend

verb
  • To terminate abnormally. 

noun
  • The abnormal termination of a program. 

  • Termination of a process prior to completion. 

knock down

verb
  • To demolish. 

  • To drink fast. 

  • To disassemble for shipment. 

  • To reduce the price of. 

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

  • 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 abend and knock down occurred in a corpus of books? (source: Google Ngram Viewer )