foreshadow vs signify

foreshadow

verb
  • To presage, or suggest something in advance. 

signify

verb
  • To show one’s intentions with a sign etc.; to indicate, announce. 

  • To mean; to betoken. 

  • To make a difference; to matter (in negative or interrogative expressions). 

  • To create a sign out of something. 

  • To give (something) a meaning or an importance. 

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