fibula vs safety pin

fibula

noun
  • An ancient kind of brooch used to hold clothing together, similar in function to the modern safety pin. 

  • The smaller of the two bones in the lower leg. 

safety pin

noun
  • A pin in the form of a clasp, which has a guard to cover the sharp point; used to join two pieces of fabric, etc., together temporarily. 

  • The pin of a hand grenade, which prevents accidental detonation. 

How often have the words fibula and safety pin occurred in a corpus of books? (source: Google Ngram Viewer )