Jekyll and Hyde

Jekyll and Hyde

[jek-uhl, jee-kuhl]
noun
a person marked by dual personality, one aspect of which is good and the other bad.

Origin:
after the protagonist of Robert Louis Stevenson's The Strange Case of Dr. Jekyll and Mr. Hyde (1886)

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World English Dictionary
Jekyll and Hyde (ˈdʒɛkəl, haɪd)
 
n
a.  a person with two distinct personalities, one good, the other evil
 b.  (as modifier): a Jekyll-and-Hyde personality
 
[C19: after the principal character of Robert Louis Stevenson's novel The Strange Case of Dr Jekyll and Mr Hyde (1886)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

Jekyll and Hyde
in ref. to opposite aspects of a person's character, from Robert Louis Stevenson's story, "The Strange Case of Dr. Jekyll and Mr. Hyde," published 1886.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

Jekyll and Hyde

A personality alternating between good and evil behavior, as in You never know whether Bob will be a Jekyll or a Hyde. This expression comes from Robert Louis Stevenson's The Strange Case of Dr. Jekyll and Mr. Hyde (1886). Also see lead a double life.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Idioms & Phrases
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