"Fixt one wagon" is an informal phrase that often comes up in conversations, referring to an act of causing someone trouble or inconvenience. When it comes to antonyms for the phrase, we can think of words that mean the opposite, such as "help," "aid," "assist," "benefit," or "support." These words depict actions that represent aiding someone in achieving their goals and objectives or providing positive reinforcement. Using these antonyms in a conversation can help us communicate our intentions of wanting to be helpful or supportive towards someone, rather than causing trouble or inconvenience to them.