bode vs impend

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. 

impend

verb
  • To threaten to happen; to be about to happen, to be imminent. 

  • Figuratively to hang over (someone) as a threat or danger. 

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