Antonyms for the phrase "keeping in line" could include words such as rebelling, deviating, straying, or diverging. These words imply a sense of moving away from or against a set of rules or expectations, rather than aligning with them. Other antonyms could include opposites such as ignoring, disregarding, overlooking, or neglecting, which suggest a lack of attention to established guidelines or guidelines altogether. Regardless of the specific word chosen, the antonyms for "keeping in line" all convey a sense of disobedience or nonconformity, highlighting the importance of following established codes of behavior or conduct.