wheels fall off
事情出错或失败，计划崩溃或破裂
口语·描述计划或项目突然失败
英文释义
to experience a sudden failure or breakdown, typically in a situation that was previously successful or stable
例句
The project was going great until the wheels fell off last week.
典故来源
源自车辆行驶中车轮脱落导致事故，比喻原本顺利的事情突然失败。