1. to be dog-tired - to be very tired. I worked until 3 in the morning. Now I’m dog-tired.
[筋疲力尽]——我工作直到凌晨3点钟。真是筋疲力尽！
2. to go to the dogs- to go to ruin, deteriorate. He spent all his time at the casino, so his business went to the dogs.
[垮掉了]——他把时间都浪费在赌博上，结果他的生意垮掉了。
3. to rain cats and dogs – to rain very hard, to pour. Every summer, we get a couple of thunderstorms and it rains cats and dogs.
[大雨倾盆]——每年夏天，这里都会下几场雷雨，真是大雨倾盆。
4. to catnap or a catnap – a short sleep or nap. After dinner, he lies down to watch T.V. and catnaps.
[小睡，小憩，打瞌睡]——晚餐后，他躺下看电视，小睡一会。
5. the cat’s meow – top quality, excellent. In his opinion, that woman is the cat’s meow.
[时尚，前卫，不同凡响]——以他之见，这位女士真是非常前卫。