- The setting or background of a historical event.
"The president spoke outside the brick exterior of the firehouse for Ladder Company 10 and Engine Company 10, against the backdrop of a 56-foot-long bronze bas-relief depicting the towers in flames. — New York Times"
- A decorated cloth hung at the back of a stage.
- (transitive) To serve as a backdrop for.
"a brilliant sunset backdropping the famous skyline"