edge除了可以指某样事物的
实际的“边，边缘”
也可以用来指“变故的边缘”
所以
push sb over the edge
用来指因不愉快的事情而
使…发狂，把某人推到崩溃的边缘
举个例子：
She had been driven over the edge
by the separation from her husband.
丈夫离她而去，把她逼向疯狂的边缘。
而在商务英语中
push sb/sth over the edge
的意思是“使...陷入困境”
举个例子：
As the number of house repossessions and bankruptcies increases, those already struggling with debt could be pushed over the edge.
随着房屋收回和破产人数的增加，那些已经在债务中挣扎的人可能会被推向崩溃边缘。
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