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Definition of object lesson noun from the Oxford Advanced Learner's Dictionary

object lesson

noun
 
/ˈɒbdʒɪkt lesn/,
 
/ˈɒbdʒekt lesn/
 
/ˈɑːbdʒɪkt lesn/,
 
/ˈɑːbdʒekt lesn/
[usually singular]
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  1. a practical example of what you should or should not do in a particular situation
    • Her calm handling of the emergency was an object lesson to us all.
See object lesson in the Oxford Advanced American Dictionary
previously
adverb
 
 
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