"collect dust" in Chinese (Simplified)
积灰落灰
Definition
长期无人使用或接触，常常导致表面堆积灰尘；也常用来比喻被忽视或搁置的事物。
Usage Notes (Chinese (Simplified))
通常为口语或比喻表达，用于形容长期不用的物品，也可指被忽视的想法或能力。常以进行时出现（“一直在积灰”）。关注于不被使用或关注，而不是清洁本身。
Examples
My old guitar has just collected dust in the closet.
我的旧吉他一直在柜子里**积灰**。
These toys collect dust because no one plays with them anymore.
这些玩具因为没人再玩，已经**积灰**了。
The book sat on the shelf, collecting dust for years.
那本书在书架上**积灰**了好几年。
Don’t just let your dreams collect dust—do something about them!
不要让你的梦想就这样**积灰**—采取行动吧！
That fancy coffee maker we bought is just collecting dust on the counter.
我们买的那个高级咖啡机就在台面上**积灰**。
He has a degree in art, but it’s just collecting dust in a drawer.
他有一张艺术学位证书，但只是放在抽屉里**积灰**。