The antonyms for the word "up cast" primarily involve words that describe downward or negative movements. These could include words such as "downward," "descend," "lower," or "sink," which all indicate a movement in the opposite direction of up. Other possible antonyms could include words like "downturn," "decline," "decrease," or "recession," which are all associated with negative economic or societal trends. Additionally, words like "fall," "slump," "tumble," or "drop" could all serve as antonyms for "up cast," indicating a sudden and significant decrease in value or importance. Ultimately, the antonyms for "up cast" serve to contextualize the concept of upward motion and contrast it with its opposite movements.