get over vs unknow

get over

verb
  • To forget and move on. 

  • To successfully communicate; to get across. 

  • To recover (from). 

  • To overcome. 

  • To score a try. 

unknow

verb
  • To undo the process of knowing, to lose knowledge of something. 

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