catch on vs larn

catch on

verb
  • To begin to understand; to realize. 

  • To become popular; to become commonplace; to become the standard. 

larn

verb
  • To learn. 

  • Larn yersel te taalk propa like! 

  • To teach. 

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