The phrase "getting out of line" implies going beyond what is acceptable or tolerable in terms of behavior or actions. The antonyms for this phrase can depend on the context, but some possible opposite terms include "keeping in line," "staying in bounds," "behaving appropriately," "respecting boundaries," and "adhering to norms." These antonyms illustrate the importance of respecting rules and guidelines, being considerate of others, and avoiding excess or extremes. Whether in personal relationships or social situations, staying within appropriate limits can foster trust, cooperation, and mutual respect, while stepping out of line can lead to conflicts, misunderstandings, and negative consequences.