Up-surging refers to the process of moving upward, increasing, or rising. Some antonyms for up-surging are declining, decreasing, subsiding, and receding. Declining means to decrease in quantity, value, or importance. Decreasing refers to the process of becoming smaller, less, or fewer. Subsiding means to become less strong or intense. Receding means to move back or away from a place or situation. These antonyms represent a decline or decrease in something that was previously growing or increasing. It is essential to understand antonyms to comprehend the meaning and context of a statement or word better.