begin vs buckle to

begin

verb
  • To start, to initiate or take the first step into something. 

  • To come into existence. 

  • To be in the first stage of some situation 

noun
  • Beginning; start. 

buckle to

verb
  • To set to work. 

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