When describing a situation where everything has been flipped or completely changed, the phrase "turn upside down" is commonly used. Other synonyms for this phrase include "upheave," "upset," "overturn," "upturn," or "flip over." To describe a more gradual change, "reverse" or "invert" can be used. A more drastic and chaotic change can be described as being "thrown into disarray" or "thrown into confusion." When referring to a person's emotions, "unsettle" or "disorient" can be seen as suitable alternatives. Regardless of the circumstance, there are always several suitable substitutes for "turn upside down".