amour vs double date

amour

noun

  • A love affair. 

  • A lover. 

  • Courtship; flirtation. 

double date

noun

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

verb

  • To go on a double date. 

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