helter-skelter vs on the double

helter-skelter

noun

  • A helical fairground slide. 

  • Confusion or turmoil. 

adj

  • Carelessly hurried and confused. 

adv

  • In confused, disorderly haste. 

on the double

prep

  • Rapidly or immediately. 

How often have the words helter-skelter and on the double occurred in a corpus of books? (source: Google Ngram Viewer )