From Longman Dictionary of Contemporary Englishflatflat1 /flæt/ ●●● S2 W2 adjective (comparative flatter, superlative flattest) 1 surfaceFLAT smooth and level, without raised or hollow areas, and not sloping or curving houses with flat roofs a perfectly flat sandy beach The countryside near there is flat as a pancake (=very flat). Work on a clean, flat surface.2 moneyBBT a flat rate, amount of money etc is fixed and does not change or have anything added to it Clients are charged a flat rate of £250 annually. We charge a flat fee for car hire.3 tyre/ballTTCDS a flat tyre or ball has no air or not enough air in it4 not deep not very deep, thick, or high, especially in comparison to its width or length The cake came out of the oven flat, not fluffy.5 drinkDFD a drink that is flat does not taste fresh because it has no more bubbles of gas in it opp fizzy 6 BORINGnot interesting [not before noun] a performance, book etc that is flat lacks interest, excitement, or energy Arsenal looked flat for large parts of the game.7 battery British EnglishHPED a flat battery has lost its electrical power syn dead American English Have you checked that the batteries haven’t gone flat (=become flat)?8 business/tradeB if prices, economic conditions, trade etc are flat, they have not increased or improved over a period of time Analysts are expecting flat sales in the coming months.9 → E flat/B flat/A flat etc10 musical soundAPM if a musical note is flat, it is played or sung slightly lower than it should be opp sharp11 voiceEMOTIONAL not showing much emotion, or not changing much in sound as you speak ‘He’s dead, ’ she said in a flat voice. 12 → a flat refusal/denial etc13 → be flat on your back14 shoesDCC flat shoes have very low heels15 lightCBRIGHT having little variety of light and dark Flat lighting is typical of Avedon’s portraits.16 → and that’s flat! —flatness noun [uncountable] → in/into a flat spin at spin2(6), → flat feetTHESAURUSflat on one level, without any holes or raised areas, and not sloping or curvinga flat roofa flat screenBefore you lay the tiles, make sure that the ground is completely flat.level not sloping in any direction, so that every part is at the same heightIs the top of this picture level?After four hours coming down the mountain, I was glad to be back on level ground.smooth without any holes or raised areas – used especially when saying how something feels when you touch ither lovely smooth skinI ran my hand across the animal’s smooth fur.even without any holes or raised areasApply the paint to an even surface.Be careful – the path is not very even here.horizontal going straight across and not slopinga horizontal lineRaise both arms to a horizontal position.
Examples from the Corpusflat• This Coke is completely flat.• Investors on Wall Street applauded the results, even though sales at stores open at least a year were essentially flat.• The horn was a little flat.• It was flat and smooth under her thick gray cotton underpants.• Cambridge is very flat and you can see for miles.• Worries over the economy have kept attendance flat at California's theme parks.• I don't know why some English people prefer flat beer.• There was a neat solid bulge where her flat belly had been.• Focaccia, an Italian flat bread, has become very popular for sandwiches.• That champagne must have gone flat by now• Home prices have stayed flat for the past year.• The game just seemed kind of flat, like they didn't care.• Stack the crepes on a flat plate.• Tails are assumed to act as stiff flat plates with continuous surfaces.• We swam out to a flat rock to sunbathe.• We sat down on a big flat rock.• Roofs, particularly flat roofs, can be damaged as a result of weight of snow lying on them.• a flat, sandy beach• If by fair you mean that everyone pays the same proportion of his income in taxes, the flat tax comes closer.• Would a flat tax save taxpayers money and time, or is it a rip-off that would help only the rich?flat as a pancake• When they came out of the oven, they looked like a tortilla, flat as a pancake.flat fee• One, for the World Resources Institute, compared ten cities that had pay-to-throw schemes with four others that charged flat fees.• At present, they pay a flat fee for a license.• You can either pay a flat fee for your access or pay per megabyte of traffic coming down your line.• Girobank charges a flat fee of £5 per draft and Barclays £9.gone flat• The effervescent eschatology of sunshine and wealth had gone flat.• What should be champagne music is no better than tepid Babycham that has gone flat.• Eventually, even her rage had gone flat and stale, leaving her with nothing but a sour taste in her mouth.• Much of the barley in the area has gone flat, he says.