Jekyll and Hyde

• Jekyll-and-Hyde
• Dr. Jekyll and Mr. Hyde

From The Strange Case of Dr. Jekyll and Mr. Hyde (1886) by Robert Louis Stevenson.

• IPA^(key): /dʒɛkəl ænd haɪd/
• IPA^(key): /dʒiːkəl ænd haɪd/ (original pronunciation, now rare)

Jekyll and Hyde (plural Jekylls and Hydes or Jekyll and Hydes)

1. Someone or something that has two sides: one good (the "Dr. Jekyll") and one bad (the "Mr. Hyde").
   • 1944, United Air Lines, Inc, Before the Civil Aeronautics Board: Briefs, Exhibits, etc. (page 28)

     The public will be better off if United and Western are true competitors, instead of a pair of Jekylls and Hydes.

   • 1974, “H2Ogate Blues”, in Winter in America, performed by Gil Scott-Heron:

     America! / The international Jekyll and Hyde / The land of a thousand disguises / Sneaks up on you but rarely surprises

   • 1977, “Dark Shroud of the Past!”, in Uncanny X-Men, number 106, page 31:

     Charles Xavier: That was my… Evil self, X-Men. The Charles Xavier who would use his powers for personal gain and conquest--The Mr. Hyde to my Dr. Jekyll.

   • 1989, “Super DuckTales Part 3: Full Metal Duck”, in DuckTales, season 3, episode 8:

     GizmoDuck: Excuse me! Just a little case of Jekyll and Hyde, that's all!

   • 2011, Mark Ryan, Geometry Essentials For Dummies, John Wiley & Sons, →ISBN, page 5:

     Studying geometry is sort of a Dr. Jekyll-and-Mr. Hyde thing. You have the ordinary geometry of shapes (the Dr. Jekyll part) and the strange world of geometry proofs (the Mr. Hyde part).

• Janus