The opposite of "setting upright" could be "knocking down" or "toppling over." These words indicate a downward or unsteady movement, rather than an upward or stable one. Other antonyms might include "flipping," "upending," or "uprooting." Each of these suggests a disruption or disturbance of the normal state, rather than a deliberate or intentional adjustment. In some situations, the opposite of "setting upright" may simply be "leaving as is," indicating a lack of change rather than a movement in the opposite direction. However, when a change is necessary or desirable, these antonyms can highlight the importance of careful and deliberate action.