Topic: BUILDING
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revolving door
1TB [countable] a type of door in the entrance of a large building, which goes around and around as people go through it
2 [singular] used to say that the people involved in a situation, organization etc change often : 
The park director position has been a revolving door for seven appointees.
The park director position has been a revolving door for seven appointees.3 [singular] used to say that people return to a situation, position etc often, but usually for a different reason : This could mean that we end up with a revolving door Congress, in which former members return as lobbyists.
This could mean that we end up with a revolving door Congress, in which former members return as lobbyists.