kiss and tell vs uncover

kiss and tell

verb
  • To betray a confidence by disclosing private information, especially of a sexual nature. 

uncover

verb
  • To show openly; to disclose; to reveal. 

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

  • To reveal the identity of. 

  • To expose the genitalia. 

  • To remove a cover from. 

  • 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 kiss and tell and uncover occurred in a corpus of books? (source: Google Ngram Viewer )