1.  crumple(v = verb.motion) break down, collapse, crumble, tumble - fall apart; "the building crumbled after the explosion"; "Negotiations broke down"
is one way to change integrity
Sample sentences: Something ----s

2.  crumple(v = verb.contact) buckle - fold or collapse; "His knees buckled"
is one way to break, cave in, collapse, fall in, founder, give, give way
Sample sentences: Something ----s; Somebody ----s

3.  crumple(v = verb.contact) cockle, knit, pucker, rumple - to gather something into small wrinkles or folds; "She puckered her lips"
is one way to crease, crinkle, crisp, ruckle, scrunch, scrunch up, wrinkle
Sample sentences: They crumple the sheets

4.  crumple(v = verb.change) crease, crinkle, rumple, wrinkle - become wrinkled or crumpled or creased; "This fabric won't wrinkle"
is one way to fold, fold up
Sample sentences: The sheets didn't crumple; These fabrics crumple easily

   To draw or press into wrinkles or folds; to crush together; to rumple; as, to crumple paper. [1913 Webster]
"They crumpled it into all shapes, and diligently scanned every wrinkle that could be made." [1913 Webster]

   To contract irregularly; to show wrinkles after being crushed together; as, leaves crumple. [1913 Webster]

crumple, v. & n.
--v.
1 tr. & intr. (often foll. by up) a crush or become crushed into creases. b ruffle, wrinkle.
2 intr. (often foll. by up) collapse, give way.
--n. a crease or wrinkle.

Idiom:
crumple zone a part of a motor vehicle, esp. the extreme front and rear, designed to crumple easily in a crash and absorb impact.

Derivative:
crumply adj.

Etymology:
obs. crump (v. & adj.) (make or become) curved

VB  be rough, go against the grain, render-rough, roughen, ruffle, crisp, crumple, corrugate, set on edge, stroke the wrong way, rumple.

N  fold, plicature, plait, pleat, ply, crease, tuck, gather, flexion, flexure, joint, elbow, double, doubling, duplicature, gather, wrinkle, rimple, crinkle, crankle, crumple, rumple, rivel, ruck, ruffle, dog's ear, corrugation, frounce, flounce, lapel, pucker, crow's feet, plication, folded, fluted, pleated.

VB  fold, double, plicate, plait, crease, wrinkle, crinkle, crankle, curl, cockle up, cocker, rimple, rumple, flute, frizzle, frounce, rivel, twill, corrugate, ruffle, crimple, crumple, pucker, turn down, double down, down under, tuck, ruck, hem, gather.