flat out /ˌflæt ˈaʊt/noun 5adjective 3adverb 2verb 2forms 4 noun5 •A baked portion of flatbread; a baked item that is not meant to rise. •A wrap, an item of food consisting of various ingredients wrapped in a tortilla or pancake. •A section of piste that is relatively flat, causing or allowing skiers to slow down.The would-be daredevils are mercifully prevented from going too fast by strategically placed flat-outs. — 1979 •An uncambered corner of racetrack; a racetrack whose corners are uncambered.The circuit is very well endowed with corners of all sorts from hairpins to flat-outs, has a 1,540-yd. straight and measures 5.2 miles, partly on an airfield, partly through a built-up area. — 1952 •(US, old-fashioned) A total failure. adjective3 •Complete, total, downright.I put up with a lot from them: sexist and racist jokes, routine descriptions of masculinist sexploitation, flat-out ridicule for my feminist views. — 2008 •Very busy.I know we are all flat out. That is the way it is. We are flat out, and it becomes a way of life. — 2006 •(Australia) Lazy, sleeping. adverb2 •At top speed.After 10 minutes of running flat out, he was out of breath. •Without hesitation or reservation, bluntly, no holds barred, totally, outright.She thought it was best to tell him she didn't love him flat out.He was flat out furious when his car was stolen. verb2 •To fail after a promising beginning; to disappoint expectations. •(no longer used) Synonym of flatten out (to make flat) formsflatted out · flatting out · flats out · flat outs