that's it
definitions
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used to indicate that something is finished or that no more is neededpt: é isso; acabou
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used to express agreement or understandingpt: entendido; exatamente
examples
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That's it, we've finished the project.
É isso, terminamos o projeto.
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That's it, I get what you mean now.
Entendido, agora entendo o que você quer dizer.