learn your lesson
US /lɜrn jʊər ˈlɛsən/
UK /lɜrn jʊər ˈlɛsən/
1.
to suffer a bad experience and understand from it not to do the same thing again
:
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After losing all his money, he finally learned his lesson about gambling.
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If you don't study, you'll fail the exam and learn your lesson the hard way.