Rat

            smell a rat觉得可疑

            I smelt a rat when he started being so helpful!

            the rat race激烈的竞争

            Living in a big city is one big rat race.

            play cat and mouse with sb. 欲擒故纵，(像猫抓耗子似地)欺负(折磨、虐待)某人

            The policeman decided to play cat and mouse when he saw the woman
            steal the dress in the store.

            Ox

            a bull in a china shop经常闯祸的人，笨手笨脚的人

            He‘s like a bull in a china shop, always knocking things over.

            take the bull by the horns不畏艰险

            You can‘t just sit back in a situation like this. You should take
            the bull by the horns.

            like a red rag to a bull使愤怒

            Any statement against the government is like a red rag to a bull
            to that minister.

            till the cows come home永远地，无限期地

            If you‘re waiting for him to pay you, you‘ll wait till the cows
            come home!

            kill the fatted calf热情款待，设宴欢迎

            He welcomed me at home by killing the fatted calf.

            Tiger

            paper tiger貌似强大而实质虚弱的敌人

            As long as we are not afraid of this kind of threat, the paper
            tiger‘s true face will come out in the wash.

            Hare

            hunt with the hounds and run with the hare同时支持相对立的两派, 脚踩两只船

            Which team are you going to support? Make up your mind now. You
            can‘t hunt with the hounds and run with the hare.

            Dragon

            sow (the) dragon‘s teeth挑起纠纷或引起争端

            Wherever he went, he sowed (the) dragon‘s teeth by preaching
            racial segregation.

            Snake

            a snake in the grass潜伏的危险或敌人，阴险而伪善的朋友

            How could I ever trust that snake in the grass?

            Horse

            hold your horses忍耐，克制，别急躁

            Don‘t get so angry. Just hold your horses and find the appropriate
            solution.

            put the cart before the horse本末倒置

            Surely you‘re putting the cart before the horse by buying all this
            furniture before you‘ve got the house.

            flog a dead horse徒劳，浪费精力

            You‘ll just be flogging a dead horse if you try to make her change
            her mind about it.

            high horse自大，盛气凌人

            When the president visited his hometown in the remote village, he
            rode the high horse among the local people.

            Sheep

            a wolf in sheep‘s clothing披着羊皮的狼，伪装善良的坏人

            Mrs. Martin trusted the lawyer until she realized that he was a
            wolf in sheep‘s clothing.

            as well be hanged for a sheep as (for) a lamb一不做，二不休；索性蛮干

            Dad said I was to be home from the dance by eleven o‘clock, but I
            enjoyed myself so much that it was midnight before I realized it, so
            I thought I might as well be hanged for a sheep as a lamb and
            stopped on till the end.

            a black sheep害群之马，败家子

            Every privileged class tries at first to whitewash its black
            sheep; if they prove incorrigible, they‘re kicked out.

            Monkey

            monkey about / around胡闹，恶作剧

            The boys were monkeying about in the playground, and one of them
            got hurt.

            monkey with胡乱折腾，瞎摆弄

            You‘ll break the TV if you don‘t stop monkeying about with it.

            get (have) one‘s monkey up生气，发脾气

            Don‘t get your monkey up for nothing.

            Cock

            cock one‘s snook (snoot) to (at) sb. 瞧不起某人

            The artist cocked a snook at the critics by exhibiting an empty
            frame.

            cock up把……弄糟

            They completely cocked up the arrangements for our holiday.

            Dog

            a dog in the manger占着茅坑不拉屎的人，自私自利的人

            Don‘t be such a dog in the manger. Lend your bicycle to him since
            you will not go out this afternoon.

            top dog处于支配地位

            Brazil can well be said to be the top dog in the soccer circles of
            the world.

            lead a dog‘s life过困苦的生活

            Many new immigrants in the U.S. initially endure a dog‘s life.

            put on the dog炫耀，摆阔；竭力表现自己，似乎自己非常重要，而事实并非如此

            They put on the dog in front of their guests, but the guests were
            not impressed.

            Pig

            pigs might fly无稽之谈，奇迹可能会发生

            “The management might offer us a decent pay rise.” “Pigs might
            fly！”

            buy a pig in a poke(未见实物而)乱买东西(吃了亏)

            You‘ll have to show me the car; I don‘t intend to buy a pig in a
            poke