to take an amount of money that has been made available

We took out a bank loan which allowed us to draw down sums of money as we needed them. 我们借了一笔银行贷款，在有需要的时候就支取一些。

to use part of a supply of goods; to reduce the number or amount of something

The stocks of ammunition were drawn down to almost zero. 弹药储备几乎耗尽。

The president is discussing how quickly we should draw down our troops in the area. 总统正在讨论我们减少这一地区的军队数量的速度。