I asked someone to borrow money, and they said they would give me an answer tomorrow, but it has been more than a day.

It's been over a day, and he hasn't contacted you yet. This is the answer. Many people don't know how to refuse in person, so they use delaying tactics. He didn't take the initiative to talk to you. If you don't contact him, you will run aground. Of course, there are special circumstances. Let's have a look. Since it is special, it is not common. Instead of waiting to know when he will contact you, find another way.