kick off vs retard

kick off

verb
  • To shut down or turn off suddenly. 

  • To make the first kick in a game or part of a game. 

  • To suddenly become more active. 

  • To start; to launch. 

  • To force the weaning of a bovine cow's calf by restricting the calf's access to its mother's udders. Used figuratively or literally. 

  • To be overcome with anger, to start an argument or a fight. 

  • To dismiss; to expel; to remove from a position. 

  • To have a fight or argument start. 

  • To die or quit permanently. 

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 kick off and retard occurred in a corpus of books? (source: Google Ngram Viewer )