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to learn one's lesson
01
to gain knowledge after experiencing something painful or disastrous
![to [learn] {one's} lesson definition and meaning](https://cdn.langeek.co/photo/43160/original/?type=jpeg "to [learn] {one's} lesson definition and meaning")
例
I certainly learned my lesson about buying something from a stranger online.
I hope you've learned your lesson.
After his reckless driving caused an accident, he finally learned his lesson about the importance of safe driving.
