Antonyms for "makes my day" are phrases or actions that cause a negative or unsatisfactory reaction. These phrases can include "ruins my day," "spoils my mood," or "brings me down." When something doesn't go as planned, it can cause disappointment, frustration, or annoyance, ultimately leaving a person feeling unsatisfied. Conversely, when something truly "makes your day," it can evoke feelings of joy, happiness, and contentment. Therefore, it is important to be mindful of what actions and phrases we use, and how they can impact those around us. Ultimately, we should strive to make the days of those around us, rather than bringing them down.