begin vs double date

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. 

double date

verb
  • To go on a double date. 

noun
  • A (romantic) date that two couples go on together. 

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