godan verb (-su)
say repeatedly; tell over and over; harp on
Often implies that the story or topic has become stale or clichéd through repetition, sometimes by many people.
その話はもう語り古されている。
That story has been told over and over again.
成功の秘訣を語り古すだけでは、誰も
If you just keep repeating the secret to success, nobody will want to listen.