a guardian or defender against theft or illegal practices or waste
a dog trained to guard property
同义词：guard dog
watchdog详细解释
watch.dog n.（名词）A dog trained to guard people or property.看家狗：训练用来保护人或财物的狗One who serves as a guardian or protector against waste, loss, or illegal practices.监察者：防止浪费、丢失或不法行为的监察或防护者 【引伸】 watch.dog. v.（动词）
