ettle vs undertake

ettle

verb
  • To take aim. 

  • To make attempt. 

  • To aim; purpose; intend; attempt; try. 

  • To expect; reckon; count on. 

  • To direct one's course. 

  • To aspire; be ambitious. 

noun
  • Intention; intent; aim. 

undertake

verb
  • To take upon oneself; to start, to embark on (a specific task etc.). 

  • To commit oneself (to an obligation, activity etc.). 

  • To pass a slower moving vehicle on the curbside rather than on the side closest to oncoming traffic. 

noun
  • The passing of slower traffic on the curbside rather than on the side closest to oncoming traffic. 

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