close up vs shut down

close up

verb
  • To shut a building or a business for a period of time. 

  • To become less 'open' or communicative, to shrink back. 

  • To heal a cut or other wound 

  • To move people closer together. 

shut down

verb
  • To close, terminate, or end. 

  • To pass (another vehicle), especially quickly. 

  • To turn off or stop. 

  • To emotionally withdraw into oneself as a defense mechanism; to block out external stressors. 

How often have the words close up and shut down occurred in a corpus of books? (source: Google Ngram Viewer )