block out vs uncover

block out

verb
  • to prevent from entering or penetrating. 

  • to cover something, so as to make it impossible to see. 

  • to prevent (a thought) from entering one's mind. 

  • to begin to reduce to shape; to mark out roughly; to lay out. 

uncover

verb
  • To expose the genitalia. 

  • To remove one's hat or cap as a mark of respect. 

  • To reveal the identity of. 

  • To remove a cover from. 

  • To show openly; to disclose; to reveal. 

  • To expose (lines of formation of troops) successively by the wheeling to right or left of the lines in front. 

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