mean to say vs signify

mean to say

verb
  • To imply or intend to convey with one's words; used to correct or clarify one's previous utterance, or to seek such clarification. 

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 mean to say and signify occurred in a corpus of books? (source: Google Ngram Viewer )