bode vs let on

bode

verb
  • To indicate by signs, as future events; to be an omen of; to portend or foretell. 

  • simple past tense of bide 

  • To betoken or augur something good or bad that will happen in the future. 

noun
  • A stop; a halting; delay. 

  • An omen; a foreshadowing. 

  • A herald; a messenger. 

let on

verb
  • to reveal or indicate, especially unintentionally or against one's wishes 

  • Used other than figuratively or idiomatically: see let, on. 

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