dead-end vs ring down the curtain

dead-end

verb

  • To come to a dead-end. 

noun

  • A road with no exit. 

  • A position that offers no hope of progress. 

adj

  • Going nowhere; blocked. 

ring down the curtain

verb

  • To end something. 

  • To mark the end of something. 

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