that's it
definitions
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used to indicate that something is finished or that no more is neededko: 그게 다야
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used to express agreement or understandingko: 알겠어; 맞아요
examples
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That's it, we've finished the project.
그게 다야, 프로젝트를 끝냈어.
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That's it, I get what you mean now.
알겠어, 이제 네 뜻이 이해됐어.