close out vs shut out

close out

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

  • 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 seal off. 

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

shut out

verb
  • To prevent from entering; to block or exclude. 

  • To prevent from scoring; to perform a shutout. 

  • To hide from sight. 

  • To refuse to be open and vulnerable toward. 

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