"Turned upside-down" is a frequently used phrase to describe a situation that has completely changed or is now the opposite of what it once was. However, there are various synonyms you can use to add more flavor to your writing such as "inverted," "upended," "flipped," "reversed," "overturned," "topsy-turvy," "upside-out," "akimbo," "overthrown," "upset," and "backwards." Each of these synonyms offers different nuances and degrees of change, and can be used in different contexts depending on the specific tone you wish to convey. So next time, get creative with your vocabulary and try using some of these synonyms instead of the usual "turned upside-down" phrase.