learn (someone's) lesson

Translations
извлечь урок
After failing the exam, he finally learned his lesson and started studying harder.
После провала экзамена он наконец извлек урок и начал учиться усерднее.
Definitions
To gain understanding or insight from a past experience, often one that was difficult or unpleasant, leading to a change in behavior or attitude.
Words
lesson

noun
урок
learn

verb
учить