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English definition of “flat”

flat

adjective (WITHOUT AIR)    /flæt/ (flatter, flattest)
B2 If something such as a tyre or ball is flat, it does not contain enough air : I got a flat tyre (US tire ) (= the air went out of it) after driving over a nail .Empty
(Definition of flat adjective (WITHOUT AIR) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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