portent vs showing finger

portent

noun
  • A portending; significance 

  • Something regarded as portentous; a marvel; prodigy. 

  • Something that portends an event about to occur, especially an unfortunate or evil event; an omen. 

showing finger

noun
  • the forefinger 

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