Meaning of “Jekyll and Hyde” in the English Dictionary

british dictionary

"Jekyll and Hyde" in British English

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Jekyll and Hydenoun [ S ]

uk /ˌdʒek.əl ənd ˈhaɪd/ us /ˌdʒek.əl ənd ˈhaɪd/ disapproving

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)