keep at bay vs rebuff

keep at bay

rebuff

noun
  • Repercussion, or beating back. 

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

  • A sudden resistance or refusal. 

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

  • To buff again. 

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