The phrase "cleaning up act" typically means improving one's behavior, often after being criticized or facing consequences. Antonyms for this phrase could include "continuing bad behavior," "worsening actions," or "ignoring criticisms." These phrases convey a lack of effort to change and a disregard for accountability. While cleaning up one's act can be difficult and require change, avoiding it can often lead to negative consequences and harm relationships. It's important to recognize when our behavior needs improvement and actively work towards making positive changes.