breakoff vs deadlock

breakoff

noun
  • discontinuance (act of breaking off) 

deadlock

noun
  • A standstill resulting from the opposition of two evenly matched forces; a stalemate or impasse. 

  • An inability to continue due to two programs or devices each requiring a response from the other before completing an operation. 

verb
  • To cause or come to a deadlock. 

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