sucker punch vs whiplash

sucker punch

noun
  • An unexpected punch or similar blow. 

  • A disabling punch targeting a place which is not normally acceptable in a "fair fight", such as on the back of the head. 

verb
  • To deliver an unexpected blow. 

whiplash

noun
  • The lash of a whip. 

  • An injury to the upper spine connected to a violent jerk of the head in either a backward or forward or side to side direction, resembling the motion of a whip. 

  • An abrupt and unexpected change, or the resulting feeling of shock. 

verb
  • To jerk back and forth; to buffet. 

  • To lash as if with a whip. 

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