call off vs repudiate

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. 

repudiate

verb
  • To be repudiated. 

  • To reject the truth or validity of; to deny. 

  • To refuse to have anything to do with; to disown. 

  • To refuse to pay or honor (a debt). 

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