knell vs ring out

knell

verb
  • To signal or proclaim something (especially a death) by ringing a bell. 

  • To ring a bell slowly, especially for a funeral; to toll. 

  • To summon by, or as if by, ringing a bell. 

noun
  • The sound of a bell knelling; a toll (particularly one signalling a death). 

  • A sign of the end or demise of something or someone. 

ring out

verb
  • To sound clearly and loudly. 

  • To eliminate the middlemen in a circular pattern of transactions. 

  • To make a phone call from an internal phone system to a general telephone network number. 

  • To equalize a sound system to eliminate feedback. 

  • To throw (an opponent) out of the arena, thereby winning. 

noun
  • A win in a fighting game obtained by throwing one's opponent out of the arena. 

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