shilly-shally vs trail (behind)

shilly-shally

verb

  • To vacillate. 

  • To procrastinate. 

noun

  • Indecision; irresolution. 

adj

  • Indecisive; wavering. 

trail (behind)

How often have the words shilly-shally and trail (behind) occurred in a corpus of books? (source: Google Ngram Viewer )