That's it means that's all, we're done: it closes a lesson, a meeting or an order. Its second meaning is exactly, that's right: people say it when someone finally understands or does something correctly.
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That's it (for today/for now). (= that's all); That's it! (= exactly, right); Is that it? (= is that all?)
- That's it for today, we'll finish the chapter on Thursday.
- — So I press this button first? — Yes, that's it!
- — Two coffees and a croissant. Is that it? — Yes, that's it, thanks.
What changed
First versionOK, everyone, it's all for today. See you on Monday.
RevisionOK, everyone, that's it for today. See you on Monday.
To end a lesson, it's tempting to say it's all, as if announcing that everything has been covered. But English wraps things up with that's it or that's all. It's all for today isn't used like that.
This is it means this is the moment, the big moment has come: This is it, the final exam starts in five minutes. That's it closes something, while this is it opens something important.
Your turn
The teacher looked at the clock and said, '___ for today. Don't forget your homework.'
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That's it — The teacher is ending the lesson, wrapping things up: that's it for today. This is it means here's the big moment, and it doesn't go with for today.
You're ending an online meeting with colleagues. Write the last line: wrap things up and say when you'll meet next.
OK, that's it for today, let's meet again on Thursday at ten.
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