The phrase "didst one's part" implies that someone has done their share of work or responsibilities. However, if we were to look for antonyms, we could consider words like "neglected," "dismissed," or "ignored." These antonyms suggest that someone has failed to fulfill their duties or has simply not bothered to contribute to the task at hand. Other antonyms might include "underperformed" or "halfhearted," which imply that someone has made some effort but has not put in their full effort. Regardless of the specific antonym, the phrase "didst one's part" implies a sense of responsibility and contribution that its opposite lacks.
