bulldog
n. countable B1 Intermediate US //ˈbʊɫˌdɔɡ// UK //bˈʊldɒɡ// bull·dog
n. a small, strong dog with a wide head and short legs. You use this word for the specific breed or for someone who is stubborn and determined.
n. a breed of dog characterized by a broad head, short muzzle, and muscular build. Also used metaphorically to describe a person who is tenacious, stubborn, or aggressively persistent.
The bulldog slept on the rug.
She is a bulldog in negotiations and never gives up.
The journalist pursued the story with bulldog tenacity, refusing to let the officials ignore the evidence.
From bull + dog, in reference to bullbaiting.