get on with vs retard

get on with

verb
  • To proceed with; to begin or continue, especially after an interruption. 

  • To have a good relationship with. 

  • To successfully use or adapt to. 

retard

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

  • To put off; to postpone. 

  • To decelerate; to slow down. 

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 get on with and retard occurred in a corpus of books? (source: Google Ngram Viewer )