the bulldog breed

Từ điển Oxford Advanced Learner 8th

the bulldog breed [the bulldog breed] BrE NAmE noun [sing+ sing/pl v]
a phrase used to refer to British people in general, and especially to British soldiers. The ↑bulldog, a strong British dog with a large head and short thick neck and legs, is traditionally used to represent qualities that some people liked to think were typically British, such as courage, loyalty and determination.
See also ↑John Bull