The term "revolving door" refers to a situation where people frequently move between different jobs or positions, often in a short period of time. This can refer to individuals changing employers multiple times within a relatively brief span, or it may also describe how employees are regularly coming and going from an organization due to resignations, firings, retirements, etc. The phrase is used to suggest that there is a high level of turnover in the workforce, which can have negative consequences for productivity, morale, and continuity within the company or institution.