and that's flat
A British expression used to signal that a decision is final and the speaker will not entertain further argument — equivalent to 'and that's that' or 'end of discussion.' The word 'flat' here means definitive or absolute, the same sense found in 'flat refusal' or 'flat out.' Now largely dated, it was typically spoken with a dismissive, authoritative tone by someone asserting their position.
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Born ~1850 · no dated citations yetDefinitions
A British expression used to signal that a decision is final and the speaker will not entertain further argument — equivalent to 'and that's that' or 'end of discussion.' The word 'flat' here means definitive or absolute, the same sense found in 'flat refusal' or 'flat out.' Now largely dated, it was typically spoken with a dismissive, authoritative tone by someone asserting their position. You might still encounter it in older British fiction or from speakers of a certain generation.
You're not going to that party on a school night, and that's flat.
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A dated British informal phrase used to close a discussion or declare a final decision, equivalent to and that's that. The flat element means definitive and without further discussion. Signals the speaker has made up their mind and will not be moved. Somewhat old-fashioned in register now; more commonly encountered in older British writing and speech than in contemporary use.
She told him he was staying home for Christmas and that's flat — no negotiation, no appeal.
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(UK, dated, informal) And that's that.
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🇬🇧About British & Irish slang slang
UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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Flatties is a slang term for flat shoes — women's shoes with little or no heel, as opposed to heels or platforms. The diminutive '-ies' suffix gives the word a casual, friendly register. Flatties are associated with comfort and practicality; choosing flatties over heels is often framed as a pragmatic or sensible decision rather than a fashion sacrifice. Used informally in British English and familiar across English-speaking countries. Not negative; the word is straightforwardly descriptive and slightly endearing.