Usually means: Exerting maximum effort or speed.
Definitions Related words Phrases (New!) Mentions
We found 23 dictionaries that define the word flat out:

General (19 matching dictionaries)
  1. flat-out, flat out: Merriam-Webster.com
  2. flat out: Oxford Learner's Dictionaries
  3. flat-out, flat out: American Heritage Dictionary of the English Language
  4. flat-out, flat-out, flat out: Collins English Dictionary
  5. flat out: Vocabulary.com
  6. Flat-Out, Flat-out, flat-out: Wordnik
  7. flat-out, flat out: Cambridge Advanced Learner's Dictionary
  8. flat-out, flat out: Wiktionary
  9. flat-out: Webster's New World College Dictionary, 4th Ed.
  10. flat-out: The Wordsmyth English Dictionary-Thesaurus
  11. flat-out: Infoplease Dictionary
  12. flat-out, flat out: Dictionary.com
  13. Flat Out (Buck Dharma album), Flat Out (John Scofield album), Flat Out (horse), Flat Out: Wikipedia, the Free Encyclopedia
  14. flat out: Rhymezone
  15. flat-out, flat out: Free Dictionary
  16. flat out: Mnemonic Dictionary
  17. flat-out, flat out: Dictionary/thesaurus

Miscellaneous (1 matching dictionary)
  1. flat out: Idioms

Slang (2 matching dictionaries)
  1. flat out, flat out: Green’s Dictionary of Slang
  2. Flat Out, flat-out: Urban Dictionary

Sports (1 matching dictionary)
  1. Hickok Sports Glossaries (No longer online)

Definitions from Wiktionary (flat out)

adjective:  Used other than figuratively or idiomatically: see flat, out.
adjective:  Complete, total, downright.
adjective:  Very busy.
adjective:  (Australia) Lazy, sleeping.
adverb:  (idiomatic) At top speed.
adverb:  (idiomatic) Without hesitation or reservation, bluntly, no holds barred, totally, outright.
noun:  (US, dated) A total failure.
noun:  A baked portion of flatbread; a baked item that is not meant to rise.
noun:  (food) A wrap, an item of food consisting of various ingredients wrapped in a tortilla or pancake.
noun:  (skiing) A section of piste that is relatively flat, causing or allowing skiers to slow down.
noun:  (motor racing, horse racing) An uncambered corner of racetrack; a racetrack whose corners are uncambered.
verb:  (intransitive) To fail after a promising beginning; to disappoint expectations.
verb:  (archaic, transitive) Synonym of flatten out (to make flat)

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