Meaning of “learn a/your lesson” in the English Dictionary

british dictionary

"learn a/your lesson" in British English

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learn a/your lesson

B2 to suffer a bad experience and know not to do it again:

I got horribly drunk once at college and that was enough - I learned my lesson.

(Definition of “learn a/your lesson” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)