deadlock vs padlock

deadlock

verb
  • To cause or come to a 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. 

padlock

verb
  • To lock using a padlock. 

noun
  • A detachable lock that can be used to secure something by means of a sliding or hinged shackle 

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