an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services)
the large log at the back of a hearth fire
something kept back or saved for future use or a special purpose
Verb:
accumulate and create a backlog
backlog的用法和样例：
例句
用作名词 (n.)
My secretary can not cope with the backlog of paperwork. 我的秘书无力处理积压下来的文书作业。
It will take a month to clear the backlog of work. 要花一个月的时间才能清理完积压的工作。
用作动词 (v.)
Orders are starting to backlog faster than we can process them. 订单开始形成积压,我们来不及处理。
