abend vs call off

abend

verb
  • To terminate abnormally. 

noun
  • The abnormal termination of a program. 

  • Termination of a process prior to completion. 

call off

verb
  • To recall; to cancel or call a halt to. 

  • To telephone in one's notice of a day's absence from work. 

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