from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. Informal In a direct manner; bluntly: told me the truth flat out.
  • adv. Informal At top speed: running flat out.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Used other than as an idiom: see flat,‎ out.
  • adj. Complete, total, downright.
  • adj. Very busy.
  • adj. Lazy, sleeping.
  • adv. At top speed.
  • adv. Bluntly, no holds barred, totally, outright.
  • v. To fail after a promising beginning; to disappoint expectations.


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    Sorry, no example sentences found.


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