call time vs ring down the curtain

call time

verb
  • To end something. 

  • To announce the closing of a pub for the day. 

  • To call a timeout. 

  • To indicate that an activity, especially the taking of a test, is complete. 

noun
  • The expected time of arrival for participants in a performance event, e.g., a play or concert. 

ring down the curtain

verb
  • To end something. 

  • To mark the end of something. 

How often have the words call time and ring down the curtain occurred in a corpus of books? (source: Google Ngram Viewer )