The word "up-growth" refers to the act of growing or developing in a positive direction or upward path. However, there are a number of antonyms or opposite words that can be used to describe growth in the opposite direction. These words include words like decline, reduction, contraction, decrease, and shrinkage. These words describe a downward path or a negative decline in growth, characterized by a decrease in size, quantity, or quality. These antonyms are often used to describe economic activities or personal development, highlighting the need to pay attention to patterns of growth and decline and to take corrective measures where necessary.