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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。
Please send the child home.
結果を失敗に帰すことになった。
It resulted in failure.
原因を調べて状況を元に帰したい。
I want to investigate the cause and restore it.