tattle vs tell tales out of school

tattle

verb
  • To chatter; to gossip. 

  • Often said of children: to report incriminating information about another person, or a person's wrongdoing; to tell on somebody. 

noun
  • A tattletale. 

  • Often said of children: a piece of incriminating information or an account of wrongdoing that is said about another person. 

  • Idle talk; gossip; (countable) an instance of such talk or gossip. 

tell tales out of school

verb
  • To reveal confidential or sensitive information; to gossip. 

How often have the words tattle and tell tales out of school occurred in a corpus of books? (source: Google Ngram Viewer )