keep one's eyes open vs keep one's eyes skinned

keep one's eyes open and keep one's eyes skinned both are verbs.

Word	Noun	Adjective	Verb	Adverb
keep one's eyes open	No	No	Yes	No
keep one's eyes skinned	No	No	Yes	No

As verbs, keep one's eyes open and keep one's eyes skinned are synonyms defined as:

keep one's eyes open and keep one's eyes skinned: pay attention; be watchful

Other synonyms of keep one's eyes open include keep one's eyes peeled.

keep one's eyes open (verb)	keep one's eyes skinned (verb)
pay attention; be watchful	pay attention; be watchful