Webster’s Revised Unabridged Dictionary · 1913
Crumple
Crum′ple (krŭm′p'l), v. t. [imp. & p. p. Crumpled (-p'ld); p. pr. & vb. n. Crumpling (-pl?ng).] [Dim. fr. crump, a.] To draw or press into wrinkles or folds; to crush together; to rumple; as, to crumple paper.
They crumpled it into all shapes, and diligently scanned every wrinkle that could be made. Addison.
Crum′ple, v. i. To contract irregularly; to show wrinkles after being crushed together; as, leaves crumple.