birds of feather.一丘之貉black sheep.害群之马break a butterfly on a wheel.小题大做cast peals before swine.明珠暗投the cat among the pigeons. 人为刀俎,我为鱼肉even a worm will turn.狗急跳墙go to the dogs.江河日下love me love my dog.爱屋及乌take a hair of the dog that bite you.以毒攻毒kill the goose that lays the golden eggs.杀鸡取卵kill two birds with one stone.一箭双雕wake a sleeping dog.惹是生非look a gift horse in the mouth.吹毛求疵neither fish nor fowl.不伦不类put/set the cart before the horse.本末倒置look like a dying duck in a thunderstorm.惊慌失措