1. In psychiatry, a patient's pattern of repeated admissions to psychiatric facilities. Since Penny is back here yet again, we need to devise a different treatment plan for her, to try and stop this revolving door syndrome.

2. The behavior exhibited by adult children who can no longer afford to live on their own and thus return home to live with their parents. My son is living with me once again and, given his disinterest in steady employment, I doubt this revolving door syndrome will ever end!