Knock one's socks off

     叹为观止

    Knock one's socks off字面解释是“把某人的袜子打落”，这个短语是什么意思呢？请看对话：

    A: How about watching a movie tonight? "Captain America" is in theaters now.

    B: Another scifi action movie? I'll pass.

    A: Come on, you will love this picture. I promise you it will knock your socks off, honey. It's highly reviewed by both moviegoers and critics.

    Note: This idiom means to "take someone by surprise" and be "very impressive." It comes from the adult entertainment industry of the 1940s and 1950s. At that time, men were difficult to cast because they were generally camera shy. When appearing on camera, the men would routinely wear sunglasses to disguise their looks; and for some odd reason they wanted to also wear their dark-colored socks. It was said that if one of these adult movies was especially provocative, it was said, more-or-less as a joke, to have the power to "knock your socks off."

    记住了吗？Knock one's socks off就是“叹为观止”。