I'm afraid she'll stand me up when it comes to the scratch.

老师，请教一下when it comes to the scratch中， scratch引申或比喻成什么意思？ 查询各种词典，都没有找到。

     【答】stand me up 【非正式】未与某人如约见面，让某人空等：I was supposed to go to a concert with Kyle on Friday, but he stood me up. 我星期五本来要跟凯尔一起去听音乐会的，但他爽约了。（摘自《朗文当代高级英语辞典》第六版）