afield vs off course

afield

adv
  • Out in the open. 

  • On the field. 

  • Away (from the home or starting point, physical or conceptual); usually preceded by far (or farther, further). 

off course

prep
  • Not following the planned, or intended, route. 

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