generate vs uncouple

generate

verb
  • To bring into being; give rise to. 

  • To produce as a result of a chemical or physical process. 

  • To procreate, beget. 

  • To form a figure from a curve or solid. 

  • To appear or occur; be generated. 

uncouple

verb
  • To come loose. 

  • To disconnect or detach one thing from another. 

  • To loose, as dogs, from their couples. 

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