take a tumble 恍然大悟；突然领悟；干得起劲

【例句】
Now, I think, I understand, is it, let me take a tumble, what is called a silver lining.
现在，我想，我明白了，是它，让我恍然大悟，什么，叫不幸中的万幸。

Look at the back of the old man away, I take a tumble.
看着那位老人渐行渐远的背影，我恍然大悟。