名詞 bulldog:

1. a sturdy thickset short-haired breed with a large head and strong undershot lower jaw; developed originally in England for bull baiting
   同義詞：English bulldog

動詞 bulldog:

1. attack viciously and ferociously
2. throw a steer by seizing the horns and twisting the neck, as in a rodeo

1. Someone gave her a bulldog.
   有人送給她一條叭喇狗。
2. He opened the drawer and took out a bulldog.
   他打開抽屜拿出了一把左輪手槍。

bull.dog

n.（名詞）
Any of a breed of short-haired dog characterized by a large head, strong, square jaws with dewlaps, and a stocky body. It was originally bred for bullbaiting.
斗牛犬，喇叭狗：一種短毛狗，特點是大腦袋，體壯，帶有垂肉的方下巴，身體結實。最早喂養(yǎng)它們是為玩嗾狗逗牛戲
A short-barreled, large-caliber revolver or pistol.
手槍：短管，大口經的左輪手槍或手槍
A heat-resistant material used to line puddling furnaces.
隔熱材料：攪煉爐的打爐底隔熱材料
Chiefly British A proctor`s assistant at Oxford University or Cambridge University.
【多用于英國】 學監(jiān)助理：牛津大學或劍橋大學里學監(jiān)的助手
adj.（形容詞）
Stubborn.
頑固的
v.tr.（及物動詞）
bull.dogged,bull.dog.ging,bull.dogs 【美國西部】
To throw (a calf or steer) by seizing its horns and twisting its neck until the animal falls.
抓住牛角將牛摔倒：抓?。ü；蜷幣５模┙牵に鼈兊牟弊又钡剿鼈兯さ篂橹?，然后把它們扔出去

【引伸】
bull.dog.ger
n.（名詞）