The antonyms for the term "piled out" are "dribbled in", "trickled in", "filed in" or "drifted in". "Piled out" implies a chaotic, unorganized exit or emergence from a place. Conversely, "dribbled in" or "trickled in" suggest a gradual or slow entry, with individuals entering one at a time. "Filed in" describes a more structured entrance, with individuals entering in an orderly, single-file manner. "Drifted in" indicates a slow and relaxed entrance, with individuals entering leisurely and without urgency. These antonyms convey a different tone or mood, providing different visual imagery to readers, and can be used depending on the context or purpose of the text.