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English definition of “flat”

flat

adjective [-er/-est only] (LEVEL)   /flæt/ (-tt-)
level and smooth; having little or no height and not raised or round: A desk provides a flat surface to work on. Campers look for flat ground to put up their tents. A drink that is flat has stopped bubbling: If you don’t put the top back on the soda bottle, it will go flat. If a tire is flat, the air has gone out of it so that it does not give the support it should: One of my tires is flat and I’ll have to change it.
(Definition of flat adjective (LEVEL) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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