expound vs redact

expound

verb
  • To make a statement, especially at length. 

  • To set out the meaning of; to explain or discuss at length 

redact

verb
  • To draw up or frame a decree, statement, etc. 

  • To black out legally protected sections of text in a document provided to opposing counsel, typically as part of the discovery process. 

  • To censor, to black out or remove parts of a document while leaving the remainder. 

  • To reduce to form, as literary matter; to digest and put in shape (matter for publication); to edit. 

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