English version

Jekyll and Hyde

From Longman Dictionary of Contemporary EnglishJekyll and HydeJek‧yll and Hyde /ˌdʒekəl ənd ˈhaɪd/ noun [countable]  CHANGE/BECOME DIFFERENTsomeone who is sometimes nice but at other times is unpleasant
Examples from the Corpus
Jekyll and HydeAs he spoke, his language grew rougher and rougher, as if a Jekyll and Hyde transformation were taking effect.
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