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English definition of “object lesson”

object lesson

noun [C] uk   approving us  
an action or story that teaches you how or how not to act, or that clearly shows the facts of a situation, usually a bad one: The disaster was an object lesson in how not to run a ship.Morality and rules of behaviour
(Definition of object lesson from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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