run up against 1. 与…相撞 The car ran up against a tree. 这辆汽车撞在一棵树上。 2. 偶然碰到 He ran up against some old acquaintances last week. 上星期他偶然遇到几个老相识。 3. 遭遇，遇到(困难等) run up against an insurmountable problem 遇到难以解决的问题 The firm ran up against strong competition. 这家公司遇到了激烈的竞争。