The phrase "keep one's eyes skinned" is a common expression used to refer to being alert, cautious, and observant. However, there are various synonyms for this phrase, including "keep one's eyes peeled," "keep a lookout," "be vigilant," "stay on the watch," "remain watchful," and "be on the alert." These synonyms offer slightly different connotations but ultimately convey the same idea of being attentive and aware of one's surroundings. Whether you use "keep one's eyes skinned" or one of its many synonyms, the important thing is to always stay aware of potential danger or opportunities.