1N-COUNT (挂在舞台后部的)彩画幕布,背景幕布 A backcloth is a large piece of cloth, often with scenery or buildings painted on it, that is hung at the back of a stage while a play is being performed. (挂在舞台后部的)彩画幕布,背景幕布 [British]
in AM, use 美国英语用 backdrop
2N-SING (事件的)背景 The backcloth to an event is the general situation in which it happens. (事件的)背景 [British, journalism, literary]
I'm not impressed by the promise of tax cuts against the backcloth of a public-spending deficit. [+ of]