keep back vs reveal

keep back

verb
  • To hold back; to refuse to give or share. 

  • To restrict or restrain. 

  • To prevent (a pupil) from advancing in a course. 

  • To stay back; to refrain from approaching. 

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. 

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