darning needle vs dragonfly

darning needle

noun
  • A damselfly, or a dragonfly that resembles one. 

  • Used other than figuratively or idiomatically: A needle used for darning. 

dragonfly

noun
  • An insect of the suborder Epiprocta or, more strictly, the infraorder Anisoptera, having four long transparent wings held perpendicular to a long body when perched. 

How often have the words darning needle and dragonfly occurred in a corpus of books? (source: Google Ngram Viewer )