1. A structure that spans a depression or provides a passage between two points which are at a height above the ground affording a passage for pedestrians, vehicles, etc.
2. At a demolition or construction site, a scaffold built over the adjacent sidewalk to protect pedestrians and motor vehicles from falling material or debris.
3. In the backstage of a theater, a platform or gallery (of fixed or adjustable height), over or alongside the stage; used by scene painters (see paint bridge), lighting operators (see light bridge), and stagehands.