elutriate vs expiate

elutriate

verb
  • To decant; to purify something by straining it. 

  • To separate large and small particles through an upwardly flowing liquid or vapid stream. 

expiate

verb
  • To purify with sacred rites. 

  • To wind up, bring to an end. 

  • To make amends or pay the penalty for. 

  • To atone or make reparation for. 

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