verb (used with object), crumpled, crumpling.
to press or crush into irregular folds or into a compact mass; bend out of shape; rumple; wrinkle.
to cause to collapse or give way suddenly: That right hook to the midsection crumpled him.
verb (used without object), crumpled, crumpling.
to contract into wrinkles; shrink; shrivel.
to give way suddenly; collapse: The bridge crumpled under the weight of the heavy trucks.
an irregular fold or wrinkle produced by crumpling.

1400–50; late Middle English; variant of crimple

crumply, adjective
uncrumpling, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crumple (ˈkrʌmpəl)
vb (when intr, often foll by up) (when tr, often foll by up)
1.  to collapse or cause to collapse: his courage crumpled
2.  to crush or cause to be crushed so as to form wrinkles or creases
3.  (intr) to shrink; shrivel
4.  a loose crease or wrinkle
[C16: from obsolete crump to bend; related to Old High German krimpfan to wrinkle, Old Norse kreppa to contract]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, crumplen, freq. of crumpen "to curl up," from O.E. crump "bent, crooked."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Crumple two sheets of newspaper and place them in the bottom of a box or pan.
Still today, websites can crumple under heavy loads.
The extra weight was built in to take care of the air bags, crumple zones and
  other safety requirements of modern cars.
After the nose of the jet curled up, the jet began to crumple.
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