The act of making or becoming wrinkled, creased, or folded; or the sound made by such wrinkling.
Present participle of 'crinkle,' from Middle English, likely imitative in origin (sound-symbolic), as 'crinkle' mimics the sound of something crinkling or wrinkling.
Many words describing sounds are onomatopoeia—they imitate the sound they describe—and 'crinkling' is perfect example: say it aloud and you almost hear the sound of paper or cellophane rustling as it wrinkles.
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