The word "ingressing" refers to the act of entering, but there are a number of antonyms that describe the opposite action. Some of the most common antonyms for "ingressing" include exiting, departing, leaving, vacating, and emigrating. These words all convey the idea of leaving or departing from a particular space or location. Other antonyms for "ingressing" might include words like retreating, withdrawing, evacuating, or abandoning, depending on the context in which the word is being used. By using antonyms for "ingressing" in our writing, we can create more effective and nuanced descriptions of actions and movements within a given space.