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revolving door   

  • noun
    plural ~ doors
    [count] :a type of door that turns in its frame when it is used and allows people to go both in and out of a large building at the same time
    [singular] a - used to describe a situation in which the people who have a particular job or position are constantly or frequently changing
    b - used to describe a situation in which someone leaves and returns to a place or position many times