To crease, wrinkle, or crumple something; to bend or twist into irregular folds or wrinkles.
Likely a variant or diminutive of crinkle (from Middle Low German krinken, to bend or twist), blended with crunch or crumple. The -le ending suggests frequentative or diminutive qualities common in dialectal English.
Crunkle belongs to a family of wonderful wrinkly words—crinkle, crumple, crease—that all use similar sounds (kr-, cr-) to describe similar motions, showing how sound and meaning intertwine in language!
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