flat out

/ˌflæt ˈaʊt//ˈflæt ˌaʊt/

adjective

Used other than figuratively or idiomatically: see flat, out.

“flat out (like a lizard in the sun) - doing absolutely nothing”

Meanings

adjectiveflat out (not comparable)

alternative flat-out

  1. not comparableUsed other than figuratively or idiomatically: see flat, out.

    So many of them took pictures, of themselves and of me, that we ran flat out of black-and-white film the second day out, and there wasn′t a Queen Mary necktie to be had in the shops after we left the port.

    1967 October 6, Dora Jane Hamblin, “Out to Sea and into History”, in LIFE, page 29
  2. not comparableComplete, 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, Shira Tarrant, Jackson Katz, Men Speak Out: Views on Gender, Sex, and Power, page 148
    1 more example

    Avoid Flat-Out Opposites The slob vs. the neatnik. The artist vs. the precision-freak. The freethinker vs. the tightass. Liberal vs. conservative. Jock vs. nerd. David vs. Goliath. Good vs. evil. Beauty and the Beast. Jekyll^([sic]) and Hyde.

    2003, Thomas B. Sawyer, Fiction Writing Demystified, page 63
  3. not comparableVery busy.

    He [Riz Ahmed] duly leaves the way he came in: smiling, flat out, up against the clock.

    2026 January 31, Danny Leigh, “Lunch with the FT: Riz Ahmed”, in FT Weekend (Life & Arts section), London: The Financial Times Ltd., →ISSN, →OCLC, page 3
    1 more example

    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, Gideon Kunda, Engineering Culture: Control and Commitment in a High-Tech Corporation, page 203
  4. Australianot comparableLazy, sleeping.

    flat out (like a lizard in the sun) - doing absolutely nothing

adverbflat out (not comparable)

alternative flat-out

  1. idiomaticnot comparableAt top speed.

    After 10 minutes of running flat out, he was out of breath.

    5 more examples

    I had travelled one morning down to Aylesbury, and had left my train, and was about to cross the footbridge, when I heard the imperious whistle of a "B1." I paused, and round the bend came the "Master Cutler" with its engine working absolutely flat out.

    1955 April, W. J. Alcock, “Unforgettable Moments”, in Railway Magazine, page 271

    I was already sliding and too dedicated to change my line and just went flat out completely off the course.

    1966 November, Steve McQueen, “Motorcycles: What I like in a Bike - and why”, in Popular Science, page 80

    When antelope are running flat out, they resemble very rapidly departing dots; some say they can hit 60 mph.

    1979 November, Bob Brister, “Apache Antelope”, in Field & Stream, page 128

    I was half way down the strip when I heard a speedboat and ran flat out back to the landing spot.

    2007, Chris Viner-Smith, Australia′s Forgotten Frontier: The Unsung Police Who Held Our PNG Front Line, page 49

    The company's growth in the rail freight market, with a mix of new-to-rail and contract gains, has led to it working flat out.

    2023 July 12, Pip Dunn, “Class 99s: the "ultimate Electro-Diesel"”, in RAIL, number 987, page 53
  2. idiomaticnot comparableWithout hesitation or reservation, bluntly, no holds barred, totally, outright.

    He was flat out furious when his car was stolen.

    5 more examples

    She thought it was best to tell him she didn't love him flat out.

    Suppose that Professor Turk has won a prestigious grant and wants to impress his hearer with this fact, without saying flat out that he won it.

    1984, Aloysius Martinich, Communication and Reference, page 38

    If, on the other hand, you simply deny flat out that you can give a metaphysical account of the concept “woman,” on the grounds that women are not essentially like one another in any respect— a position that, it′s important to notice, entails a commitment to your thinking that the idea of giving such an account is at least coherent— then you leave yourself with a problem about how to justify a politics based on the oppression of women.

    2001, Nancy Bauer, Simone de Beauvoir, Philosophy, & Feminism, page 38

    “You′re gonna die,” he flat-out told Arfons.

    2003 October, “Fool Speed Ahead”, in Cincinnati Magazine, page 128

    Sometimes an eagerly promoted product turns out to be a joke — and sometimes it′s just flat out dangerous to life, limb, or commerce.

    2005 March, Seth Masia, “Almost Hits, Mostly Misses”, in Skiing Heritage: Journal of the International Skiing History Association, page 35
nounflat out (plural flat outs)

plural flat outs · alternative flat-out

  1. USdatedA total failure.
  2. A baked portion of flatbread; a baked item that is not meant to rise.

    His hands were of the same somber hue as the bare feet of the children who clustered near the table, looking toward it whistfully^([sic]) until the eldest mustered sufficient courage to ask his mother for "one of 'em yere flat-outs."

    1881, Mary E. Jackson, The Spy of Osawatomie; Or, The Mysterious Companions of Old John Brown, page 296
  3. foodA wrap, an item of food consisting of various ingredients wrapped in a tortilla or pancake.
  4. hobbiesA 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 November, Tamsin Venn, “The Pleasures of Keystone”, in Skiing, page 107
  5. hobbiesAn 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, Motor, volume 102, number 2654, page 31
verbflat out (third-person singular simple present flats out, present participle flatting out, simple past and past participle flatted out)

present singular third person flats out · participle present flatting out · participle past flatted out · past flatted out · alternative flat-out

  1. intransitiveTo fail after a promising beginning; to disappoint expectations.
    1 more example

    1894, Mark Twain, Tom Sawyer Abroad, 2015, Tom Sawyer Collection: All Four Books, Enhanced Media, page 413, I see myself there warn't no sense in the tale, to chop square off that way before it come to anything, but I warn't going to say so, because I could see Tom was souring up pretty fast over the way it flatted out […] .

  2. archaictransitiveSynonym of flatten out (to make flat)

    Synonyms: flatten out

Synonyms & antonyms

verbSynonym of flatten out (to make flat)

More synonyms by meaning

adverbin a blunt direct manner

adverbat top speed

Similar
like blue murder

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

flat out. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/flat%20out

MLA

“flat out.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/flat%20out. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “flat out,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/flat%20out.

Source: flat out on Wiktionary, CC BY-SA 4.0.