go off at a tangent vs turn away

go off at a tangent

turn away

verb
  • To rotate the body or head so as not to face someone or something. 

  • To refuse to admit someone. 

  • To bend or turn from a fixed course. 

  • To avert or deflect something. 

How often have the words go off at a tangent and turn away occurred in a corpus of books? (source: Google Ngram Viewer )