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Jekyll and Hyde

[jek-uh l, jee-kuh l] /ˈdʒɛk əl, ˈdʒi kəl/
noun
1.
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)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Jekyll and Hyde

Jekyll and Hyde

/ˈdʒɛkəl; haɪd/
noun
1.
  1. a person with two distinct personalities, one good, the other evil
  2. (as modifier): a Jekyll-and-Hyde personality
Word Origin
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for Jekyll and Hyde

in reference 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. The surname Jekyll is of Breton origin and was originally a personal name.

"Though so profound a double-dealer, I was in no sense a hypocrite. Both sides of me were in dead earnest; I was no more myself when I laid aside restraint and plunged in shame, than when I labored, in the eye of day, at the furtherance of knowledge or the relief of sorrow and suffering." [Robert Louis Stevenson, "The Strange Case of Dr. Jekyll and Mr. Hyde," 1886]

Online Etymology Dictionary, © 2010 Douglas Harper
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Idioms and Phrases with Jekyll and Hyde

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® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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