The antonyms for the phrase "stay in line" are many, as there are quite a few words that can describe the opposite of acting in line or following principled behavior. A few antonyms for "stay in line" could be words like: reject conformity, rebel against norms, break with convention, flout the rules, disregard protocols, defy authority or refuse to comply. Each of these words points to a departure from the norm, a lack of adherence to rules or guidelines, or a defiance of authority. While remaining in line can be seen as a positive trait that ensures order and discipline, going against it can sometimes be seen as a bold move that breaks new ground or challenges the status quo.