Real Dictionary

revolving door
Some large buildings have revolving doors instead of an ordinary door. They consist of four glass doors which turn together in a circle around a vertical post.

revolving door in American English
a door consisting of three to five upright panels hung on a central axle, and turned around by pushing on one of the panels: used to keep out drafts of air
noun: an entrance door for excluding drafts from the interior of a building, usually consisting of four rigid leaves set in the form of a cross and rotating about a central, vertical pivot in the doorway

revolving door in British English
noun: a door that rotates about a central vertical axis, esp one with four leaves arranged at right angles to each other, thereby excluding draughts

revolving door in Hospitality
noun: Some large buildings have revolving doors instead of an ordinary door. They consist of four glass doors which turn together in a circle around a vertical post.

revolving-door in American English
designating or of the practice in which a former employee of a government department goes to work for a private company regulated by that department

revolving-door in British English
adjective: (of a business or government) changing personnel on a frequent basis