(~s)
1.
A ~ is a large piece of cloth, often with scenery painted on it, that is hung at the back of a stage while a play is being performed.
= backcloth
N-COUNT
2.
The ~ to an object or a scene is what you see behind it.
Leeds Castle will provide a dramatic ~ to a fireworks display next Saturday...
= background
N-COUNT: usu N prep
3.
The ~ to an event is the general situation in which it happens.
The election will take place against a ~ of increasing instability.
= background
N-COUNT: usu N prep