(also runckle) Now chieflyScottish and Irish English (northern )
noun
A wrinkle; a crease.
Origin
Late Middle English; earliest use found in Cursor Mundi: a Northumbrian poem of the 14th century. Origin uncertain. Perhaps from early Scandinavian, perhaps showing a blend with wrinkle. Compare later ruckle. Perhaps compare also Middle Dutch (rare) wronckelen to twist, to wind, and the related noun wronckel.
runkle2
/ˈrʌŋkl/
(also runcle)
verb
[no object]And with object. To wrinkle, rumple; (in later use also, of fabric, clothing, etc.) to ruck up.
Apparently largely restricted to Scottish use between the 18th and early 20th centuries..
Origin
Late Middle English; earliest use found in The Prick of Conscience. Probably from runkle.