extend vs fatten

extend

verb
  • To possess a certain extent; to cover an amount of space. 

  • To reenlist for a further period. 

  • To increase in quantity by weakening or adulterating additions. 

  • To value, as lands taken by a writ of extent in satisfaction of a debt; to assign by writ of extent. 

  • To straighten (a limb). 

  • Of a class: to be an extension or subtype of, or to be based on, a prototype or a more abstract class. 

  • To increase in extent. 

  • To cause to increase in extent. 

  • To cause to last for a longer period of time. 

  • To bestow; to offer; to impart; to apply. 

fatten

verb
  • To make thick or thicker (something containing paper, often money). 

  • To become thick or thicker. 

  • To make (soil) fertile and fruitful. 

  • To become fertile and fruitful. 

  • To cause (a person or animal) to be fat or fatter. 

  • To become fat or fatter. 

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