go off vs retard

go off

verb
  • To pass off; to take place; to be accomplished. 

  • To explode metaphorically; to become very angry. 

  • To putrefy or become inedible, or to become unusable in any way. 

  • To fire, especially accidentally. 

  • To begin clanging or making noise. 

  • To explode. 

  • To depart; to leave. 

  • To like less. 

  • (chiefly UK, of epoxy resins) To cure; to set. 

  • To ejaculate. 

  • To stop operating; to switch off. 

retard

verb
  • To put off; to postpone. 

  • To decelerate; to slow down. 

  • To keep delaying; to continue to hinder; to prevent from progressing. 

noun
  • Retardation; delay. 

  • A slowing down of the tempo; a ritardando. 

  • A person or being who is extremely stupid or slow to learn. 

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