Crumple can be pictured as a shape giving way. Something was holding itself open — a flat sheet of paper, the front of a car, a person standing up, a line of defenders — and then it is pressed, or it simply lets go. It folds in on itself and ends up smaller, bent, and covered in folds that run every way. Nothing is folded and nothing flies apart; the shape is just no longer being held.
From the word’s history
Wiktionary derives crumple from Middle English crumplen, a repeating form of crumpen 'to curl up', from Old English crump 'bent, crooked' — crump plus -le. Bent again and again is exactly what a crushed shape looks like.
Wiktionary 把 crumple 追到中古英文 crumplen，是 crumpen（捲起來）的反覆形，再往前是古英文 crump（彎的、歪的），等於 crump + -le。一再地彎、一再地折，結果就是一個被擠成一團的形狀。
Wiktionary entry for crumple, supplied in this evidence packet (kaikki:3f6f69a190036ae4:756363734:25237)
登入就可以看每一支怎麼連回核心畫面。