snag

n. 暗礁(隐患)
vt 清除困难(清铲,粗加工,绊住)

I have a snag in my best black tights.

我最好的一条黑裤袜给划破了。

The negotiations struck a snag when the union leaders asked for paid holidays in addition to the usual wage increase.

当工会领袖们要求在通常的工资增加之外还应有带薪假日时，商谈遇到了阻碍。