like the cat that ate the canary 偷吃了腥的猫，形容人得意的样子

a cat nap 打个盹儿

a fat cat 口语中指“大亨，阔佬”

let the cat out of the bag 泄露秘密，说走了嘴

He was sitting there grinning like the cat that ate the canary.

他坐在那儿笑得洋洋得意。

I'm going to try to squeeze in a cat nap before my next shift starts.

下回轮班前我要挤时间打个盹儿。

The cat has got your tongue.

瞬间说不出话来,不知道说什么好。