下课了，我一下楼的把脚给崴了。

After class, I went down to the foot to sprain.

youdao

我一下楼，窃贼便狂奔而逃。

As soon as I came downstairs the burglar bolted out.

youdao

一下楼，我便看见妈妈在煮团圆，只见那珍珠般的团圆在锅里翻滚、跳跃，看来连它们也迫不及待地想过年了。

A downstairs, I saw my mother in cooking together, see the pearly reunion in a pan, tumbling, jumping, it seems that even they can't wait to New Year's day.

youdao

So, one of the bizarre side effects is some people with Ambien while sleeping go downstairs, open up their refrigerator and eat huge amounts of food.

服用安必恩的其中一个副作用,就是梦游走下楼，打开冰箱，吃一大堆东西。

耶鲁公开课 - 心理学导论课程节选