flash in the pan vs mischance

flash in the pan

noun
  • A career notable for early success not followed by significant accomplishment. 

  • A transient occurrence with no long-term effect. 

mischance

verb
  • To undergo (a misfortune); to suffer (something unfortunate). 

noun
  • Bad luck, misfortune. 

  • A mishap, an unlucky circumstance. 

How often have the words flash in the pan and mischance occurred in a corpus of books? (source: Google Ngram Viewer )