When something is turned upside down, it can also be described as being bottom-side up. However, there are a few alternative synonyms that can be used to convey the same meaning. One similar phrase is "inverted," which specifically references the act of flipping something over so that what was once at the top is now at the bottom. Another possible synonym is "upended," which suggests that something has been turned over completely or forcefully. Additional options include "reversed," which can indicate a deliberate or unintentional backwards position, or "topsy-turvy," a whimsical phrase that brings to mind a playful, chaotic state of affairs.