verb · to miss a chance or let an opportunity slip by

打印的时候出了点差错，把其中几页的页码给落空了。

verb · to omit or neglect to do something

填表时请看清楚，不要把这一项落空了。

verb · to fail to achieve something; to be fruitless

费了半天口舌，结果事儿还是落空了。

verb · to fail; to fall through; to come to nothing

他的计划最终落空了。