peter vs safety-deposit box

peter

noun
  • A safe. 

  • A prison cell. 

  • The penis. 

verb
  • Chiefly followed by out: originally (mining), of a vein of ore: to be depleted of ore; now (generally), to diminish to nothing; to dwindle, to trail off. 

  • Synonym of blue peter 

safety-deposit box

noun
  • A safe-deposit box. 

How often have the words peter and safety-deposit box occurred in a corpus of books? (source: Google Ngram Viewer )