Keep Under One's Hat

keep something a secret
保密

Although the contestants were most anxious to know who won the prizes in the panio competition, the judges kept the results under their hats. They kept the results a secret so that the formal announcements could be made in public at the awards ceremony.

Dressed to Kill

wear one's finest clothing
穿着某人最好的衣服

The reception for the new Swedish ambassador at the Jennison's was quite lavish. Naturally, everybody was dressed to kill. Since it was a formal occasion, everyone was dressed in their finest, most elegant clothes.

Give Someone the Slip

make a getaway
逃跑

The police were chasing the thief through the streets of the city, but he managed to give them the slip. No wonder. There were so many people around that the thief managed to escape by getting lost in the crowds.

Knock Someone's Socks Off

enthuse and excite
狂热而激动

A: Hi, John. What's new?
B: Oh, nothing too much with me, but you ought to see Alfredo's new car. It'll knock your socks off!
A: So, he finally got that Italian sports car he's been dreaming about.
B: He sure did! When you see all the custom features that it has, you'll get so enthused and excited you won't know what to do!
A: Boy, I can hardly wait to go for a ride in it!