/ ˈbækdrɒp; NAmE -drɑːp/ ( BrE also back·cloth ) noun
1.
a painted piece of cloth that is hung behind the stage in a theatre as part of the scenery
2.
everything that can be seen around an event that is taking place, but which is not part of that event :
The mountains provided a dramatic backdrop for our picnic.
➡ note at environment
3.
the general conditions in which an event takes place, which sometimes help to explain that event :
It was against this backdrop of racial tension that the civil war began.