bulldog

Short definition from Wiktionary

Noun

1. 1
   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.
2. 2
   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: The original form of this breed, the British bulldog.
3. 3
   A stubborn or determined person.
4. 4
   A refractory material used as a furnace lining, obtained by calcining the cinder or slag from the puddling furnace of a rolling mill.
5. 5
   One of the proctors' officers.
6. 6
   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.
7. 7
   A bulldog edition.
8. 8
   Any of various species of African freshwater fish in the genus Marcusenius, a type of elephantfish.
9. 9
   The children's game of British Bulldog or Red Rover.

Verb

1. 1
   To force oneself (in a particular direction).
2. 2
   To chase (a steer) on horseback and wrestle it to the ground by twisting its horns (as a rodeo performance).