Cách sử dụng
The expression "run up" means to accumulate or increase something quickly or rapidly. For example, if you use your credit card a lot, you might "run up" a large debt. Similarly, if you spend too much money on something, you could "run up" a big bill. The expression can also refer to running quickly up a hill, staircase, or other incline. So, you might say, "I ran up the stairs to my apartment," or "I had to run up the hill to catch the bus." To sum up, "run up" is used to describe a fast increase in something, or to talk about quickly climbing up a steep path or staircase.