The Scots have their own word for everything too. No need to rely on the damned Sassenach for vocabulary.
A jockteleg is a folding knife. Scots, 17th century, possibly referring to leg-shaped knife-handles or possibly a Scots corruption of 'Jacques de Liege', a reference to the Liege cutlery widely used in Scotland at the time.
Jock has two legs, a sporran, and a folding knife.
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PETER THE PROOFER CAN FIX IT!