reveal vs tone down

reveal

noun
  • The outer side of a window or door frame. 

  • A revelation; an uncovering of what was hidden in the scene or story. 

verb
  • To communicate that which could not be known or discovered without divine or supernatural instruction. 

  • To uncover; to show and display that which was hidden. 

tone down

verb
  • To make a television program, piece of writing, etc. less offensive and so more suitable for a family audience. 

  • To moderate or relax; to diminish or weaken the striking characteristics of; to soften. 

  • To relax; to make quieter or less obtrusive; to make milder. 

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