in two shakes (of a lamb's tail) 马上，一晃

羔羊摇尾巴的速度很快，这可能是短语 “in two shakes of a lamb's tail（羔羊摇两下尾巴的工夫）” 的来源。人们用它表示 “马上就做某件事情，一晃就好”。现在，在口语会话中，人们更常使用这个短语的简短形式 “in two shakes”。

例句

I'm on my way. I'll be there in two shakes.

我在路上，马上就到。

My car wouldn't start but in two shakes of a lamb's tail, my friend turned up to help me fix it.

我的车发动不起来了，但才一晃的工夫，我的朋友就过来帮我修车了。

Don't go anywhere. Dinner will be ready in two shakes of a lamb's tail.

哪儿也别去。晚饭立马就好。