close out vs knock off

close out

verb
  • To terminate; to call the end of. 

  • To terminate a computer program. 

  • To make trades offsetting an existing position, leaving the trader with a neutral position. 

  • Of a wave, to break all at once, instead of progressively along its length. 

  • To exclude by blocking all opportunities to enter or join. 

  • To seal off. 

  • Synonym of close (“to make a sale”) 

knock off

verb
  • To defeat. 

  • To rob. 

  • 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. 

  • To accomplish hastily. 

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