fall through

1descend accidentally through掉进

The boy fell through the ice and was drowned.这个男孩掉入冰水中淹死了。

2fail to be completedfail to occur失败;不执行;落空

If your new agreement falls throughthe workers in your company will go on strike.如果你们的新协议不落实,贵公司的工人就要罢工了。

I hope the plan doesn't fall through a second time owing to lack of funds.我不希望这项计划因缺少资金再次落空。

We are going on a picnic tomorrowunless it falls through because of the weather.我们明天要去野餐,除非天气不好去不成。