bull mastiff
US /ˈbʊlˌmæstɪf/
UK /ˈbʊlˌmæstɪf/
1.
a large, powerful breed of dog, typically fawn or brindle with a black mask, originally bred from the bulldog and mastiff to guard estates.
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The Bullmastiff stood guard at the entrance, a formidable presence.
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She adopted a rescue Bullmastiff with a gentle temperament.