excommunicate vs keep at arm's length

excommunicate

verb
  • To exclude from any other group; to banish. 

  • To officially exclude someone from membership of a church or religious community. 

adj
  • Excommunicated. 

noun
  • An excommunicated person. 

keep at arm's length

verb
  • Avoid direct confrontation or struggle. 

  • Avoid a close relationship. 

  • Keep at a distance, away from one's body. 

How often have the words excommunicate and keep at arm's length occurred in a corpus of books? (source: Google Ngram Viewer )