foreshadowing vs threat

foreshadowing

noun
  • A literary device whereby an author drops hints or symbolic representations of plot developments to come later in the story. 

threat

noun
  • An expression of intent to injure or punish another. 

  • A person or object that is regarded as a danger; a menace. 

  • An indication of potential or imminent danger. 

verb
  • To press; urge; compel. 

  • To use threats; act or speak menacingly; threaten. 

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