An organization or institution with a high rate of turnover of personnel or membership.
2.
A door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings. Synonym:revolver.
... The revolving door, through which Linda sedately permitted herself to be moved, opened into a high space of numerous columns and benches, writing-desks and palms. At the back was the white room where, usually alone, she had ... — Linda Condon • Joseph Hergesheimer
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