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
the cat weeping over the dead mouse猫哭老鼠
a narrow winding trail羊肠小道
even a worm will turn狗急跳墙
black sheep害群之马
kill two birds with one stone一箭双雕
glare like a tiger eyeing its prey虎视眈眈
pull a tooth from the tiger‘s mouth虎口拔牙
a tiger ‘s head and a snake‘s tail虎头蛇尾
dragons and fishes jumbled together鱼龙混杂
pass off fish eyes as pearls鱼目混珠
monsters and demons牛神蛇鬼
the fox borrows the tiger‘s fierceness狐假虎威
a pack of rogues狐朋狗党
evil associates狐朋狗友
in bits and pieces鸡零狗碎