The phrase "swinging door" is used to describe a door that moves back and forth on hinges. It can also be used metaphorically to represent constantly changing circumstances or situations.
Sentences with «swinging door»
Closed cases with swing doors immediately start paying for themselves with up to 65 percent energy savings. (fooddrink-magazine.com)
It's rare for folks to swing the door into their lives wide open. (fullframe.edweek.org)
Once an industrial space, the office now features a modern fireplace and giant leather - clad swinging doors in its lobby. (inc.com)