abend vs conk out

abend

verb
  • To terminate abnormally. 

noun
  • The abnormal termination of a program. 

  • Termination of a process prior to completion. 

conk out

verb
  • to stop functioning 

  • to die 

  • to fall fast asleep; to sleep soundly 

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