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English definition of “flat”

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flat

adverb
 
 
/flæt/
fall flat to be unsuccessful: The deal fell flat when the two sides could not agree on the terms of the contract.
flat out informal as hard or as fast as possible: Towards the end of the project the whole department was working flat out to meet the deadlines.
(Definition of flat adverb from the Cambridge Business English Dictionary © Cambridge University Press)
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