close out vs preface

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”) 

preface

noun
  • An introduction, or series of preliminary remarks. 

  • A title or epithet. 

  • The beginning or introductory portion that comes before the main text of a document or book. 

  • The prelude or introduction to the canon of the Mass. 

verb
  • To give a preface to. 

  • To introduce or make a comment before (the main point). 

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