keep at arm's length vs rebuff

keep at arm's length

verb
  • Avoid direct confrontation or struggle. 

  • Avoid a close relationship. 

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

rebuff

verb
  • To refuse; to offer sudden or harsh resistance; to turn down or shut out. 

  • To buff again. 

noun
  • Repercussion, or beating back. 

  • He was surprised by her quick rebuff to his proposal. 

  • A sudden resistance or refusal. 

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