revolving door

noun4

1. •
   A door that rotates around a central pivot.
2. •
   A movement of personnel between roles as legislators and regulators, on the one hand, and members of the industries affected by the legislation and regulation, on the other.

   • We've had 14 Secretaries of State through the revolving door in the first 23 years of this century. And the civil servants rotate through the departments with similar speed. — 2023
3. •
   (figurative) A system or institution that people exit and immediately reenter.
4. •
   Synonym of recidivism.