Meaning of “learn a lesson” in the English Dictionary

american-english dictionary

"learn a lesson" in American English

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learn a lesson

also learn your lesson

to understand something because of an unpleasant experience, esp. when this means you will not do it again:

My computer crashed before I saved the document – I've learned my lesson, and now I save everything all the time.

(Definition of “learn a lesson” from the Cambridge Academic Content Dictionary © Cambridge University Press)