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English definition of “and that's flat!”

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and that's flat!

UK informal
used to tell someone that the decision you have just announced will not change even if they try to persuade you to change it: I'm not coming, and that's flat!
Translations of “and that's flat!”
in Chinese (Traditional) 沒有商量的餘地,就這麼定了…
in Chinese (Simplified) 没有商量的余地,就这么定了…
(Definition of and that's flat! from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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