Zip vs bulldog

Zip

noun
  • A Sicilian or Italian Mafioso who is relatively new to the United States. 

bulldog

noun
  • Any move in which the wrestler grabs an opponent's head and jumps forward, so that the wrestler lands, often in a sitting position, and drives the opponent's face into the mat. 

  • A breed of dog developed in England by the crossing of the bullbaiting dog and the Pug to produce a ladies' companion dog, having a very smooth coat, a flattened face, wrinkly cheeks, powerful front legs, and smaller hind legs. 

  • A stubborn or determined person. 

  • The original form of this breed, the British bulldog. 

  • A bulldog edition. 

  • Any of various species of African freshwater fish in the genus Marcusenius, a type of elephantfish. 

  • One of the proctors' officers. 

  • A refractory material used as a furnace lining, obtained by calcining the cinder or slag from the puddling furnace of a rolling mill. 

verb
  • To force oneself (in a particular direction). 

  • To chase (a steer) on horseback and wrestle it to the ground by twisting its horns (as a rodeo performance). 

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