on the skew vs upside down

on the skew

adv

  • slantwise 

upside down

adv

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

  • In great disorder. 

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. 

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