retrospect vs ring a bell

retrospect

verb
  • To look or refer back to; to reflect on. 

noun
  • Consideration of past times. 

ring a bell

verb
  • Used other than figuratively or idiomatically: see ring, a, bell. 

  • To seem at least vaguely familiar. 

  • To spark a previously forgotten memory. 

How often have the words retrospect and ring a bell occurred in a corpus of books? (source: Google Ngram Viewer )