that's it
definitions
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used to indicate that something is finished or that no more is neededes: eso es; ya está
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used to express agreement or understandinges: entendido; exactamente
examples
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That's it, we've finished the project.
Eso es, hemos terminado el proyecto.
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That's it, I get what you mean now.
Entendido, ahora entiendo lo que quieres decir.