
to send (someone) back; to send (someone) home
「帰す」 has another reading with different meanings.
遅くなったので子供を家に帰した。
Since it got late, I sent the child home.
終電がなくなる前に、彼女をタクシーで帰した。
I sent her home by taxi before the last train was gone.
体調が悪そうだったので、早めに彼を帰した。
Since he looked unwell, I sent him home early.