Welcome to English in a Minute.
Making decisions is important, and it can be difficult. When you ask people to decide something, you might hear them say: It's up to you!
To find out what this one means, let's listen to this conversation.
A: What do you want for dinner tonight?
B: I'm not sure. What do you want?
A: It's up to you. Whatever you want, we will have.
When you say, "it's up to you," it's another way to say that you want the other person to choose. That might be because you can't decide, or you are being nice and are letting someone else choose.
It's up to you!
And that's English in a Minute.