ban.dog

n.（名詞）
A dog, such as a mastiff, kept chained as a watchdog or because of its ferocious aggressiveness.
猛犬，門犬：用鏈子鎖著作為看門狗或因其生性兇殘而用鏈子鎖著，如獒犬

來源：
Middle English band-dogge
中古英語 band-dogge
band [leash, chain] * see band
band [皮帶，鏈條] *參見 band
dogge [dog] * see dog
dogge [狗] *參見 dog