St Giles' Greek
English
Etymology
The term comes from the St Giles' area of present-day central London which, during the 17th and 18th centuries, was notorious as a refuge for thieves and other criminals.
Proper noun
St Giles' Greek
- (cant) A secret language, as spoken by beggars and thieves.
References
- The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.