amble vs mystery tour

amble

noun
  • An unhurried leisurely walk or stroll. 

  • An easy gait, especially that of a horse. 

verb
  • To stroll or walk slowly and leisurely. 

  • Of a quadruped: to move along by using both legs on one side, and then the other. 

mystery tour

noun
  • A short-duration outing by coach to a destination that is not revealed in advance 

How often have the words amble and mystery tour occurred in a corpus of books? (source: Google Ngram Viewer )