Collins Concise English Dictionary © HarperCollins Publishers::

crumple /ˈkrʌmpəl/ vb
  1. when intr, often followed by up: to collapse or cause to collapse
  2. when tr, often followed by up: to crush or cause to be crushed so as to form wrinkles or creases
  1. a loose crease or wrinkle
Etymology: 16th Century: from obsolete crump to bend; related to Old High German krimpfan to wrinkle, Old Norse kreppa to contract

'crumpled' also found in these entries:

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