hang the cost/expense

the cost is not important ; with no regard for the price

别管多少钱

Just buy it and hang the expense!

买吧，别管它多少钱!

We have to get the roof fixed before the next storm, so call the contractor and hang the cost.

我们必须在下次暴风雨来临之前把屋顶修好，所以打电话给承包商，别管费用了。