To process (a photographic plate or film) too long or in too concentrated a solution.
To obligate (oneself) beyond a limit, especially a financial one.
To allow to grow
Find another word for overexpand. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for overexpand, like: grow too much, develop too much, grow too fast, develop too fast, overdevelop, overextend and grow.