Overexpand is a verb that means to extend or enlarge beyond the limits of proper or reasonable proportion. Some synonyms of overexpand include overgrow, overstretch, overinflate, overdevelop, overextend, and overreach. These words express the idea of going too far beyond what is necessary or desirable, resulting in problems or complications. Overgrowth and overstretch are commonly used to describe physical expansion and stretching beyond capacity. Overinflate and overdevelop are often used to describe an excessive increase in value or importance. Overextend and overreach both indicate a stretching too far beyond one's abilities or resources. Overall, these synonyms convey the negative consequences of overexpansion or overreaching.