Leaving or coming home from kindergarten/nursery school (the act of children leaving the daycare).
降園時間は午後四時です。迎えを忘れないでください。
Pickup time is 4:00 PM. Please don't forget to pick them up.
今日は雨なのでバスで降園する予定です。
It's raining today, so the child is scheduled to go home by bus.
降園後、近くの公園で友だちと遊んだ。
After daycare, (the child) played with friends at a nearby park.