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Definition of bulldog:

  1. A refractory material used as a furnace lining, obtained by calcining the cinder or slag from the puddling furnace of a rolling mill.
  2. A variety of dog, of remarkable ferocity, courage, and tenacity of grip; - so named, probably, from being formerly employed in baiting bulls.
  3. Characteristic of, or like, a bulldog; stubborn; as, bulldog courage; bulldog tenacity.

Synonyms:

English Bulldog, pertinacious, dour, dogged, stubborn, unyielding, tenacious.

Usage examples: