What does the word bulldog mean?

Usage examples for bulldog

  1. The bulldog strain asserted itself, and he was his own again. – A Man and a Woman by Stanley Waterloo
  2. The bulldog planted himself in the middle of the path and blinked at his sworn enemy. – The Puppet Crown by Harold MacGrath
  3. He was a sinister- looking figure, with dark, insolent eyes, and the jaw and throat of a bulldog. – The Green Flag by Arthur Conan Doyle