that's it
definitions
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used to indicate that something is finished or that no more is neededfr: c'est tout; c'est fini
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used to express agreement or understandingfr: compris; tout à fait
examples
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That's it, we've finished the project.
C'est tout, nous avons terminé le projet.
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That's it, I get what you mean now.
Compris, je comprends ce que tu veux dire maintenant.