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English definition of “teach sb a lesson”

teach sb a lesson

C2 A person or experience that teaches you a lesson improves your future behaviour by making you experience the bad effects of your actions: Having my car stolen really taught me a lesson - I'll never leave it unlocked again. She decided to teach the boy a lesson.
(Definition of teach sb a lesson from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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