close up vs hebetate

close up

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

  • To heal a cut or other wound 

  • To move people closer together. 

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

hebetate

verb
  • To render obtuse; to dull; to blunt. 

adj
  • obtuse; dull 

  • Having a dull or blunt and soft point 

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