They had wanted it to be a surprise but theplan didn't come off.
他们本想一鸣惊人，然而计划却流产了。
《牛津词典》
2
Their plan was called off at the eleventh hour.
他们的计划在最后时刻被取消了。
3
The Conservatives' planning reform explicitly gives rural development priority over conservation, even authorising "off-plan" building where local people might object.