expect vs opine

expect

verb
  • To predict or believe that something will happen 

  • To consider obligatory or required. 

  • To consider reasonably due. 

  • To be pregnant, to consider a baby due. 

opine

verb
  • To have or express an opinion; to state as an opinion; to suppose, consider (that). 

  • To give one's formal opinion (on or upon something). 

noun
  • Any of a class of organic compounds, derived from amino acids, found in some plant tumours 

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