napping vs on the hop

napping

noun
  • The act of taking a nap or short sleep. 

  • The act or process of raising a nap, as on cloth. 

on the hop

prep
  • Playing truant from school. 

  • Spontaneous; unplanned. 

  • Unprepared; unready and unable to deal with something. 

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