a reference to a person with a hidden dark or evil side, from the famous fictional character Dr. Jekyll and Mr. Hyde.
From Robert Louis Stevenson's 1886 novella 'Strange Case of Dr Jekyll and Mr Hyde,' where Jekyll is a respectable doctor with a sinister alter ego. The name itself may derive from old Scottish words.
Stevenson wrote the entire novella in just three days during a fever dream, and the dual-nature concept was inspired by real Victorian anxieties about hidden desires and double lives behind respectable facades.
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