blindside vs harrow

blindside

verb
  • To attack (a person) on his or her blind side. 

  • To catch off guard; to take by surprise. 

noun
  • The blindside flanker, a position in rugby union, usually number 6. 

  • A person's weak point. 

  • A tram/train driver's field of blindness around a tram (trolley/streetcar) or a train; the side areas behind the tram/train driver. 

  • The space on the side of the pitch with the shorter distance between the breakdown/set piece and the touchline; compare openside. 

  • A driver's field of blindness around an automobile; the side areas behind the driver. 

harrow

verb
  • To traumatize or disturb; to frighten or torment. 

  • To drag a harrow over; to break up with a harrow. 

  • To break or tear, as if with a harrow; to wound; to lacerate; to torment or distress; to vex. 

noun
  • An obstacle formed by turning an ordinary harrow upside down, the frame being buried. 

  • A device consisting of a heavy framework having several disks or teeth in a row, which is dragged across ploughed land to smooth or break up the soil, to remove weeds or cover seeds; a harrow plow. 

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