noun
old haunts; former home; old nest
Refers to a place one used to frequent or live in, often with nostalgic or figurative overtones. Can be used for a former workplace, team, or group.
彼は久しぶりに古巣のチームに戻った。
He returned to his old team after a long time.
引退した選手が古巣の球場を訪れた。
The retired player visited his old home stadium.