fall off vs unite

fall off

verb
  • To diminish in size, value, etc. 

  • To fall into sin; stray. 

  • To change the direction of the sail so as to point in a direction that is more down wind; to bring the bow leeward. 

  • To become detached or to drop from. 

unite

noun
  • A British gold coin worth 20 shillings, first produced during the reign of King James I, and bearing a legend indicating the king's intention of uniting the kingdoms of England and Scotland. 

verb
  • To bring together as one. 

  • To come together as one. 

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