flat

/flæt/ adj [-er/-est only] (-tt-) (LEVEL)

Definition

› 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 adj (LEVEL) from the Cambridge Academic Content Dictionary © Cambridge University Press)