hunker down vs scrunch up

hunker down and scrunch up both are verbs.

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

As verbs, hunker down and scrunch up are synonyms defined as:

Other synonyms of hunker down include crouch, hunker, scrunch, squat.

hunker down (verb)	scrunch up (verb)
hold stubbornly to a position	make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic
sit on one's heels	sit on one's heels
take shelter