The phrase "did again" means to repeat an action or behavior. The antonyms of "did again" would be words or phrases that imply an opposite action or behavior. Some possible antonyms for "did again" include: refrained, abstained, avoided, neglected, ignored, and discontinued. Each of these words implies an action of not repeating or avoiding a previous action. For example, if someone refrained from doing something again, they chose not to repeat that action. Alternatively, if someone discontinued a behavior, they permanently stopped doing it. Overall, the antonyms of "did again" provide a range of options for people who want to express the opposite of repeating an action.