“解围”常见的英文表达有 “relieve someone from a difficult situation”、“extricate someone from a predicament” 或更简洁的 “save the day”（在特定语境下，侧重于成功化解危机、扭转局面） 、“help out of a tight spot”。以下为你分别举例：
例句：His timely arrival relieved me from the difficult situation of being surrounded by enemies.
翻译：他的及时赶到把我从被敌人包围的困境中解救了出来。
例句：We need to think of a way to extricate our friend from this predicament.
翻译：我们需要想个办法把我们的朋友从这困境中解救出来。
例句：The superhero saved the day by defeating the villain at the last minute.
翻译：这位超级英雄在最后一刻打败了反派，成功解围。
例句：My classmate helped me out of a tight spot when I forgot my homework.
翻译：当我忘记带作业时，我的同学帮我解了围。