jekyll
⇨ Jekyll and Hyde; jekyll
1. adjective
false, counterfeit, sham, bogus, two-faced. Rhyming slang for SNIDE; a neat pun formed from, and referring to the dual personality of the eponymous character in The Strange Case of Dr Jekyll and Mr Hyde, by Robert Louis Stevenson, 1886 UK, 1959
2. noun
a forgery, a fake. Rhyming slang, extended from the adjective sense of SNIDE (false, counterfeit, sham, bogus, etc.) UK, 1992