scrunch up vs sit down

scrunch up and sit down both are verbs.

Word	Noun	Adjective	Verb	Adverb
scrunch up	No	No	Yes	No
sit down	No	No	Yes	No

As verbs, sit down is a hypernym of scrunch up; that is, sit down is a word with a broader meaning than scrunch up:

scrunch up: sit on one's heels
sit down: be in a position in which one's upper body is largely upright and supported by one's backside

Other hypernyms of scrunch up include sit.

scrunch up (verb)	sit down (verb)
make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic	show to a seat; assign a seat for
sit on one's heels	be in a position in which one's upper body is largely upright and supported by one's backside
	take a seat