Etymology
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scrunch (v.)

1825, "to bite, crush with or as with the teeth," intensive form of crunch (v.); ultimately imitative (see scr-). The colloquial meaning "to squeeze, crush" is by 1835 (implied in scrunched). The intransitive sense of "contract oneself into a more compact shape" is by 1884. Related: Scrunching. As a noun, "noise made by scrunching," by 1857; as an adjective, scrunchy is attested by 1905. 

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Definitions of scrunch
1
scrunch (v.)
make a noise typical of an engine lacking lubricants;
Synonyms: crump / thud
scrunch (v.)
sit on one's heels;
Synonyms: squat / crouch / scrunch up / hunker / hunker down
scrunch (v.)
make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic;
Synonyms: wrinkle / ruckle / crease / crinkle / scrunch up / crisp
2
scrunch (n.)
a crunching noise;
From wordnet.princeton.edu