Definition (清空)
To completely empty the contents of a container or its items.
清理；彻底清空
We need to turn out the warehouse and get rid of all the old items.
我们需要清理仓库，并处理掉所有旧物品。
Before moving, we need to turn out these boxes and empty everything inside.
搬家前，我们需要清空这些箱子，把里面的东西全部拿出来。
She spent the whole day turning out her closet and emptying it out completely.
她花了一整天的时间清空她的衣橱，彻底整理了一遍。