The term "upgrowths" refers to the process of expanding and growing upwards. Some antonyms of upgrowths that represent a contrasting notion include stagnation, recession, and decline. Stagnation indicates a period of inactivity without any significant growth or development, whereas recession implies a decline in economic activity, followed by a contraction of the economy. Finally, decline refers to a continuous decrease in the quality, quantity, or value of something. The antonyms of upgrowths depict contrasting ideas, all implying a slowing or reversal of growth in one form or another.