beget vs touch off

beget

verb
  • To cause; to produce. 

  • To bring forth. 

  • To father; to sire; to produce (a child). 

  • To happen to; befall. 

touch off

verb
  • To start; to cause, especially used for unstable situations that may magnify if disturbed. 

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