Definition of “and that's flat!” - English Dictionary

british dictionary

“and that's flat!” in British English

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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!

(Definition of “and that's flat!” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)