Definition: If something unpleasant piles up, you get more and more of it. Level: B2
我的工作开始在我的办公桌上堆积起来了。
My work is starting to ___pile ___up on my desk.
我的工作堆积如山，所以我需要加班。
My work has ___piled ___up, so I need to work late.
涨价之后，关于服务的投诉开始大量涌现。
Complaints about the service began to ___pile ___up after the price increase.
