Antonyms for the phrase "cropping up again" could include phrases such as "disappearing for good," "vanishing permanently," "never resurfacing," "discontinuing altogether," and "ceasing to exist." These phrases imply a finality and conclusive end to the issue at hand, rather than the repetitive or recurring nature implied by "cropping up again." Additionally, antonyms could include words such as "improving," "resolving," "settling," or "solving," indicating that the problem has been tackled and overcome, rather than continuing to present ongoing challenges. Overall, the antonyms for "cropping up again" suggest a sense of closure and resolution, as opposed to an ongoing and unresolved issue.