student asking question

What's "that's it" mean? Does "it" mean something here?

teacher

Native speaker’s answer

Rebecca

"That's it" is an expression used to mean that something is finished, or completed. Here, the speaker has used it to mean that he has finished sharing his list, that he is done talking. Ex: You can only choose "yes" or "no." That's it. Ex: That's it. We're finally done the school semester!

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