knock 是“敲打”的意思，而 sock 是“袜子”的意思，knock my socks off直译"把我的袜子打飞"，引申为使我大吃一惊，使我叹为观止。

【例句】
She is the most - looking woman I’ve seen for a long time, so she will knock your socks off.
她是见过的最漂亮的女人，所以他一定会惊艳到你。

Her amazing taken in singing really knocks my socks off.
她惊人的唱歌天赋实在是让我五体投地。