The antonym for "up risen" is "downfallen". "Up risen" means to rise up or ascend, whereas "downfallen" refers to a sudden and catastrophic decline, fall or collapse. The word "downfallen" carries a negative connotation, indicating a loss of power, position, or status. It can also imply an emotional or psychological setback. An example of "downfallen" in a sentence can be "After the company's stocks plummeted, their once impressive reputation had downfallen." Therefore, the opposite of "up risen" is "downfallen", representing a stark contrast between progress and defeat.