fluke vs piece of good fortune

fluke

verb
  • To obtain a successful outcome by pure chance. 

  • To fortuitously pot a ball in an unintended way. 

noun
  • A metal hook on the head of certain staff weapons (such as a bill), made in various forms depending on function, whether used for grappling or to penetrate armour when swung at an opponent. 

  • Waste cotton. 

  • Either of the two lobes of a whale's or similar creature's tail. 

  • A trematode; a parasitic flatworm of the Trematoda class, related to the tapeworm. 

  • A lucky or improbable occurrence, with the implication that the occurrence could not be repeated. 

  • In general, a winglike formation on a central piece. 

  • A flounder. 

  • Any of the triangular blades at the end of an anchor, designed to catch the ground. 

piece of good fortune

How often have the words fluke and piece of good fortune occurred in a corpus of books? (source: Google Ngram Viewer )