upside down vs upsy-down

upside down

adj

  • Inverted; turned so that the top is at the bottom. 

  • In great disorder. 

  • Owing more money for something than it is worth; having negative equity. 

adv

  • In great disorder. 

  • Inverted, so that the top is now at the bottom. 

upsy-down

adj

  • upside down 

adv

  • upside down 

How often have the words upside down and upsy-down occurred in a corpus of books? (source: Google Ngram Viewer )