"Keep an eye peeled" is an idiomatic expression that means to stay alert or watchful. There are different synonyms for this phrase, including "be vigilant," "stay focused," "keep a lookout," "be observant," and "stay on guard." These phrases imply the need for staying alert and aware of one's surroundings to detect any potential danger or opportunity. It is essential to keep an eye peeled, especially when traveling or dealing with unfamiliar situations. By being vigilant, observant, and staying on guard, people can avoid risks and make the most out of any opportunity that may come their way.