Meaning of “backdrop” - Learner’s Dictionary

backdrop

noun [ C ] uk us /ˈbækdrɒp/
SITUATION

the situation that an event happens in:

[ usually singular ] The attack took place against a backdrop of rising tensions between the two communities.
CLOTH

the painted cloth at the back of a stage in a theatre

(Definition of “backdrop” from the Cambridge Learner’s Dictionary © Cambridge University Press)