begin vs refrain

begin

verb
  • To be in the first stage of some situation 

  • To come into existence. 

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

noun
  • Beginning; start. 

refrain

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

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