Interactive: 1. Used alone in response to a question or the expectation in your addressee that you will say more or add more details to mean that you are finished and there is no more to say or no more explanation to be given. English = 'That's all!', 'That's it!', 2. 'That's the end of the story!', 'End of story!', 'And that's that!', and so on. As Modifier: 1. Used at the end of a sign sentence to mean you are finished with adding details or giving explanations, especially if you have been brief and/or your partner is expecting more. English = 'And that's that!'