keep at bay vs repulse

keep at bay

repulse

verb
  • To repel or drive back. 

  • To reject or rebuff. 

  • To cause revulsion in. 

noun
  • the act of repulsing or the state of being repulsed 

  • refusal, rejection or repulsion 

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