An unanticipated or sudden check in progress; a reverse or defeat. The project faced a major setback when the lead engineer resigned.
A distance by which something is set back, especially a building from a road or boundary. The new regulations require a setback of at least 10 feet from the property line.
A step-like recession in a building's profile above a certain height, typically used to allow light and air to reach the street. Many Art Deco skyscrapers incorporate setbacks to comply with zoning laws.