intercross vs multiply

intercross

verb
  • To breed two strains having a common ancestry with one another 

  • To cross back over one another 

noun
  • The act or product of intercrossing 

multiply

verb
  • To breed or propagate. 

  • To grow in number. 

  • To perform multiplication. 

  • To be a factor in a multiplication with (another factor). 

  • To increase the amount, degree or number of (something). 

  • To perform multiplication on (a number). 

noun
  • An act or instance of multiplying. 

adv
  • In many or multiple ways. 

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