a British term for a sandwich, especially one made with a single filling like 'chip butty' (French fries) or 'jam butty' (jam sandwich).
From 'butter,' likely because sandwiches were traditionally spread with butter. First documented in British English in the early 1900s as dialectal/working-class terminology.
The word 'butty' reveals class and geography—it's working-class British English, dismissively omitted from fancy dictionaries but absolutely essential to understanding British food culture and social language.
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