Arab vs double Dutch

Arab

noun
  • A member of an Arabic-speaking community 

  • An inhabitant of Arabia or the Arab world 

  • An Arabian horse. 

  • A Semitic person, whose forebears were from Arabia 

adj
  • Of or pertaining to Arabs and their nations. 

double Dutch

noun
  • Incomprehensible language. 

  • A game of jump rope with two ropes and frequently two jumpers. 

  • A language game akin to pig Latin. 

  • Sex using a condom and the contraceptive pill at the same time. 

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