Definition of bulldog noun from the Oxford Advanced Learner's Dictionary

 

bulldog

 noun
noun
BrE BrE//ˈbʊldɒɡ//
 
; NAmE NAmE//ˈbʊldɔːɡ//
 
Domesticated mammals
 
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a short strong dog with a large head, a short flat nose and a short thick neck See related entries: Domesticated mammals
See the Oxford Advanced American Dictionary entry: bulldog