To wrinkle, crease, or crumple something; a Scottish and Northern English dialect word.
From Middle Low German 'runkel' or Dutch 'runkel', possibly related to the Scandinavian 'rynka'. The word was borrowed into Scottish and Northern dialects where it remained in regional use.
The word 'runkle' is a linguistic island—it survived in Scottish dialect regions while similar words from Middle Low German disappeared elsewhere, making it a time capsule of medieval trade language between Britain and the Baltic.
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