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English definition of “Jekyll and Hyde”

Jekyll and Hyde

noun [S] uk   /ˌdʒek.l̩.əndˈhaɪd/ disapproving us  
a person with two very different sides to their personality, one good and the other evil: The professor was a real Jekyll and Hyde - sometimes kind and charming, and at other times rude and obnoxious.
(Definition of Jekyll and Hyde from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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