blindside vs skull

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. 

skull

verb
  • To hit in the head with a fist, a weapon, or a thrown object. 

  • To strike the top of (the ball). 

noun
  • A crust formed on the ladle, etc. by the partial cooling of molten metal. 

  • The mind or brain. 

  • The crown of the headpiece in armour. 

  • A shallow bow-handled basket. 

  • The main bones of the head considered as a unit; including the cranium, facial bones, and mandible. 

  • These bones as a symbol for death; death's-head. 

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